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# Ask a Mathematics(Class XI-XII Tuition (PUC)) Question

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Vikas 08/11/2016 in  Mathematics(Class XI-XII Tuition (PUC)),

What do you mean by direction ratios of a vector?

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A

Anu 08/11/2016 in  Mathematics(Class XI-XII Tuition (PUC)),

What do you mean by section formula with respect to vector in mathematics?

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K

Krishna 08/11/2016 in  Mathematics(Class XI-XII Tuition (PUC)),

What do you mean by scalar or dot product of two vectors?

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W

Wren 08/11/2016 in  Mathematics(Class XI-XII Tuition (PUC)),

What do you mean by projection of a vector on a line?

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P

Praveen 08/11/2016 in  Mathematics(Class XI-XII Tuition (PUC)),

What do you mean by projection of a vector on a line?

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A

Akhilesh 08/11/2016 in  Mathematics(Class XI-XII Tuition (PUC)),

If angle is 90 degree and 270 degree, then the what is the projection of vector of AB?

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A

Alifiya 08/11/2016 in  Mathematics(Class XI-XII Tuition (PUC)),

If vector a = 5i + j + 3k and vector b = i + j + 5k, then show that the vectors a + b and a - b are perpendicular?

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S

Shishir 08/11/2016 in  Mathematics(Class XI-XII Tuition (PUC)),

Find the projection of the vector a = 2i + 3j + 2k on the vector b = i + 2j + k?

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R

Rakes 05/11/2016 in  Mathematics(Class XI-XII Tuition (PUC)),

Solve: 5! ?

0 0 3

Eti replied | 19/11/2016

120

Richa replied | 20/11/2016

5*4*3*2*1=120

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K

Kamal 05/11/2016 in  Mathematics(Class XI-XII Tuition (PUC)),

Write an equation for the nth term of the geometric sequence 3, 12, 48, 192,....?

0 0 3

Tapas replied | 29/11/2016

Here, a = 3, and r = 4.
So, tn = a x r^(n-1) = 3 x 4^(n-1).

Sarvajeet replied | 03/12/2016

Tn = a x (4 power (n-1)).

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C

Chandra 04/11/2016 in  Mathematics(Class XI-XII Tuition (PUC)),

If [cube of (1 - i / 1 - i)] - [cube of (1 - i / 1 + i)] = x + iy, then the value of (x, y)?

Sarvajeet replied | 03/12/2016

(1,-1).

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N

Neha 04/11/2016 in  Mathematics(Class XI-XII Tuition (PUC)),

If [square of (1 + i)] / 2 - i = x + iy, then find the value of x + y?

Sarvajeet replied | 03/12/2016

0.

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H

Himani 04/11/2016 in  Mathematics(Class XI-XII Tuition (PUC)),

What is the general equation of complex number?

K

K.vaishali replied | 11/12/2016

x + iy.

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G

Granth 04/11/2016 in  Mathematics(Class XI-XII Tuition (PUC)),

What is the value of [square root of (-25)] * [square root of (-9)]?

Tapas replied | 30/11/2016

See the attachment:

Sarvajeet replied | 03/12/2016

-15.

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R

Rajini Sucharita 04/11/2016 in  Mathematics(Class XI-XII Tuition (PUC)),

2 is a real number or imaginary number with respect to complex number?

Sarvajeet replied | 03/12/2016

A real number.

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N

Nageswara 05/11/2016 in  Mathematics(Class XI-XII Tuition (PUC)),

How many words can be formed by using all letters of the word â€˜BIHARâ€™?

Tapas replied | 28/11/2016

Here, all the letters are different and there are 5 letters. So, the number of words = 5! = 120.

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R

Rituparna 05/11/2016 in  Mathematics(Class XI-XII Tuition (PUC)),

How many 3-digit numbers can be formed from the digits 2, 3, 5, 6, 7, 9 which are divisible by 5 and none of the digits is repeated?

Tapas replied | 04/12/2016

For all the numbers the last digit must be 5. So, the 1st, and the 2nd places are occupied by 2, 3, 6, 7, and 9 without any repetition. So, this can be done by taking 2 digits at a time from the above 6 digits.
The number of ways this can be done is 6P2 = !6/!(6-2) = !6/!4 = (6x5x4x3x2x1)/(4x3x2x1) = 6x5 = 30. (Answer)

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R

Raja 05/11/2016 in  Mathematics(Class XI-XII Tuition (PUC)),

What is value of (100) P (2)?

Sreedevi replied | 01/12/2016

(100)! / 98!

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A

Abhinav 05/11/2016 in  Mathematics(Class XI-XII Tuition (PUC)),

Find out the number of ways in which 6 rings of different types can be worn in 3 fingers?

Anil replied | 01/12/2016

Each ring has a choice of 3 fingers, so no of ways =3^6. There are no restrictions.

Sanjeev replied | 03/12/2016

6C3*3! = 60.

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C

Chandramami 05/11/2016 in  Mathematics(Class XI-XII Tuition (PUC)),

What is the difference between permutation and combination?

Sreedevi replied | 02/12/2016

Permutation involves selection and arrangement where as Combination involves only selection.

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S

Sriram 05/11/2016 in  Mathematics(Class XI-XII Tuition (PUC)),

Solve: (9) P (3)?

Sarvajeet replied | 03/12/2016

504.

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D

Deepak 05/11/2016 in  Mathematics(Class XI-XII Tuition (PUC)),

What is the general equation for binomial theorem?

Aswin replied | 20/11/2016

(a+b)^n+

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R

Renu 05/11/2016 in  Mathematics(Class XI-XII Tuition (PUC)),

Solve: [(99) power 4]?

Rachna replied | 21/11/2016

(100-1)^4 and then substitute a=100;b=-1 in the binomial expansion of (a+b)^n

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D

Disha 05/11/2016 in  Mathematics(Class XI-XII Tuition (PUC)),

Find the four arithmetic means between 16 and 91?

Tapas replied | 29/11/2016

Here, the arithmetic means are p, q, r, and s.
So, 16, p, q, r, s, 91, ..... are in A. P. in which t1 = 16, and t6 = 91.
Solving , we can get, a = 16, d = 15.
so, p = 16 + 15 = 31, q = 31+15 = 46, r = 46 + 15 = 61, s = 61 + 15 = 76.
So, the arithmetic means are: 31, 46, 61, 76.

Sarvajeet replied | 03/12/2016

31, 46, 61, 76.

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M

Madhu 05/11/2016 in  Mathematics(Class XI-XII Tuition (PUC)),

Find the next four terms of arithmetic sequence: 12, 16, 20,....?

Tapas replied | 29/11/2016

24, 28, 32, 36.

Sarvajeet replied | 03/12/2016

24, 28, 32, 36.

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