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S

Sumimolss 02/11/2016 in  Class IX-X Tuition, Mathematics(Class IX-X Tuition), Probability

Can the experimental probability of an event be a negative number? If not why?

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Sreedevi replied | 02/12/2016

The probability of the outcome of an experiment is never negative.

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K

Kiran 02/11/2016 in  Class IX-X Tuition, Mathematics(Class IX-X Tuition), Probability

Can the experimental probability of an event be greater than 1? Justify your answer?

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Sreedevi replied | 02/12/2016

No, because the number of successes and failures should be equal to 1.

0 0

Sreedevi replied | 02/12/2016

No, because the number of successes and failures should be equal to 1.
The probability of an event will not be less than 0. This is because 0 is impossible (sure that something will not happen). The probability of an event will not be more than 1. This is because 1 is certain that something will happen.

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M

Meraj 02/11/2016 in  Class IX-X Tuition, Mathematics(Class IX-X Tuition), Probability

Find the probability of getting a number less than 5 in a single row of a die?

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Sreedevi replied | 02/12/2016

In the single throw of a die, the sample space n(S) = 6; let 'E' be the event of getting '5'. n(E) = 1; P(E) = n(E) /n(S); P(E) = 1/6.

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J

Jyoti 02/11/2016 in  Class IX-X Tuition, Mathematics(Class IX-X Tuition), Probability

One card is drawn from a well shuffled deck of 52 cards. Find the probability of drawing an ace?

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Sreedevi replied | 02/12/2016

There will be 4 aces (Event E) that belongs to 4 different types say hearts, clubs, diamonds and spades. The probability of getting an ace of 52 cards (sample space = 52) is given by the ratio of favourable events to sample space.
P(E) = n(E) / n(S); P(E) = 4/52; P(E) = 1/4.

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R

Ravindra 02/11/2016 in  Class IX-X Tuition, Mathematics(Class IX-X Tuition), Probability

Two dice are thrown. What is the probability of obtaining a total of 10 or 11?

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Mamata replied | 25/11/2016

Sample space = {(1,1), (1,2,), ........, (5,6), (6,1), (6,6)}
Number of sample space or cardinality of S = |s|= 36
Let A be the event of getting total of 10 or 11
A={(5,5),(5,6),(4,6),(6,4),(6,5)}.
|A|=5.
P(A)= |A|/|S|= 5 / 36.

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M

Mukul 02/11/2016 in  Class IX-X Tuition, Mathematics(Class IX-X Tuition), Trigonometry

If angle sin A = 1/2, then the value of cot A?

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T Raghavender replied | 26/11/2016

SinA = 1/2. =>A=30 degrees, cotA = cot30 = root 3.

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Sarvajeet replied | 02/12/2016

sin A = 1/2, cos A = square root 3 /2.
cot A = square root 3.

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B

Baiju 02/11/2016 in  Class IX-X Tuition, Mathematics(Class IX-X Tuition), Trigonometry

What is the value of (tan 1 degree tan 2 degree tan 3 degree…...tan 89 degree)?

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Suyash replied | 19/11/2016

Here,
tan 1°× tan 89° = tan 1° × cot 1 ° = 1
& Similarly,
tan 2°× tan 88° = 1 as so on.
So the value of,
tan1° × tan2° × ... tan 89° = tan 45° = 1

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R

Ramya 03/11/2016 in  Class IX-X Tuition, Mathematics(Class IX-X Tuition), Sets

Two finite sets have m and n elements. The number of subsets of the first set is 112 more than that of the second set. What is the value of m and n respectively?

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Ram Mohan replied | 23/11/2016

The Values of m & n are : m=7 and n=4 for detailed solution, Please see the attachment.

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T

Tahir 03/11/2016 in  Class IX-X Tuition, Mathematics(Class IX-X Tuition), Sets

Power set of the set A = {1, 2} is _______ ?

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Chandan replied | 22/11/2016

2 power 2 = 4 (Ans)

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A

Apoorva 03/11/2016 in  Class IX-X Tuition, Mathematics(Class IX-X Tuition), Sets

Define Universal set?

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Ram Mohan replied | 18/11/2016

Universal set is a set, which is the union of all the sets involved in the context of the Question/ Problem.

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S

Shurbik 03/11/2016 in  Class IX-X Tuition, Mathematics(Class IX-X Tuition), Sets

Define set?

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Chandan replied | 22/11/2016

A collection of "things" (objects or numbers, etc).
Each member is called an element of the set.
There should be only one of each member (all members are unique).
Here is a set of clothing items.
Another Example: {1,2,3,4} is the set of counting numbers less than 5

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T

Tanvi 02/11/2016 in  Class IX-X Tuition, Mathematics(Class IX-X Tuition), Surface Areas

What is the circumference of the circle if its radius is 2r?

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T

Taranum 02/11/2016 in  Class IX-X Tuition, Mathematics(Class IX-X Tuition), Surface Areas

What is the area of a sphere if its radius 2r?

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G

Geeta 02/11/2016 in  Class IX-X Tuition, Mathematics(Class IX-X Tuition), Surface Areas

What is the radius of the sphere if a cone is 8.4 cm high and the radius of its base is 2.1 cm. and it is melted and recast into a sphere?

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H

Harvir 02/11/2016 in  Class IX-X Tuition, Mathematics(Class IX-X Tuition), Surface Areas

What is the curved surface area of a cylinder, if its radius is doubled and height is halved?

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P

Poonam 02/11/2016 in  Class IX-X Tuition, Mathematics(Class IX-X Tuition), Surface Areas

What is the total surface area of a cone whose radius is r/2 and slant height is 2l?

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P

Prasad 02/11/2016 in  Class IX-X Tuition, Mathematics(Class IX-X Tuition), Surface Areas

What number of planks can be stored of dimensions 4 m * 50 cm * 20 cm in a pit which is 16 m long, 12 wide and 4 m deep?

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R

Rakesh 02/11/2016 in  Class IX-X Tuition, Mathematics(Class IX-X Tuition), Surface Areas

What is the length of the longest pole that can be put in a room of dimensions: 10 m * 10 m *5 m?

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C

Chhavi Kumar 02/11/2016 in  Class IX-X Tuition, Mathematics(Class IX-X Tuition), Surface Areas

The radius of a hemispherical balloon increases from 6 cm to 12 cm as air is being pumped into it. What is the ratios of the surface areas of the balloon in the two cases?

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S

Sajjan 02/11/2016 in  Class IX-X Tuition, Mathematics(Class IX-X Tuition), Surface Areas

What is the surface area of the cube if its sides are 45 cm each?

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M

Mayur 02/11/2016 in  Class IX-X Tuition, Mathematics(Class IX-X Tuition), Surface Areas

Is it true that the radius of a cylinder is doubled and height is halved, the volume will be doubled?

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U

Umamahesh 02/11/2016 in  Class IX-X Tuition, Mathematics(Class IX-X Tuition), Surface Areas

How many square metres of canvas is required for a conical tent whose height is 3.5 m and the radius of the base is 12 m?

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H

Harshitha 02/11/2016 in  Class IX-X Tuition, Mathematics(Class IX-X Tuition), Surface Areas

A cylindrical roller 2.5 m in length, 1.75 m in radius when rolled on road was found to cover the area of 5500 sq. m. How many revolutions did it make?

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S

Sujit 02/11/2016 in  Class IX-X Tuition, Mathematics(Class IX-X Tuition), Surface Areas

A shopkeeper has one spherical has one spherical laddoo of radius 5 cm. With the same amount of material, how many laddoos of radius 2.5 cm can be made?

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D

Dhanya 02/11/2016 in  Class IX-X Tuition, Mathematics(Class IX-X Tuition), Surface Areas

A right triangle with sides 6 cm, 8 cm and 10 cm is revolved about the side 8 cm. Find the volume and the curved surface of the solid so formed?

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