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Lesson Posted 2 days ago Schools/State Board Schools

TN 9th maths Set Theory EX :1.4

Sivaraj

I like to share my knowledge.

In an examination 50% of the students passed in Mathematics and 70% of students passed in Science while 10% students failed in both subjects. 300 students passed inat least one subject. Find the total number of students who appeared in the examination,if they took examination in only two subject? Solution: Given Passed... read more

In an examination 50% of the students passed in Mathematics and 70% of students passed in Science while 10% students failed in both subjects. 300 students passed in

at least one subject. Find the total number of students who appeared in the examination,

if they took examination in only two subject?

Solution:

Given

Passed percentage in M=50%, S=70%,

300 students passed in atleast one subject.

10% failed in both subject.

so remaining 90% passed atleast in one subject.

n(M∪S)=n(M)+n(S)-n(M∩S)

90%=50%+70%-n(M∩S)

n(M∩S)=30%

so, 30% of X=300

X=1000.

The total number of students is 1000.

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Comments Answered on 02 Jul Tuition Schools/CBSE Schools CBSE/Class 11

Sanjana Singh

Tutor

Scalars are quantities that are fully described by a magnitude (or numerical value) alone. Vectors are quantities that are fully described by both a magnitude and a direction. area is NOT a vector. But it can be "represented" by one. If you are dealing with planar regions in three dimensions, then it... read more

- Scalars are quantities that are fully described by a magnitude (or numerical value) alone.
- Vectors are quantities that are fully described by both a magnitude and a direction.
- area is NOT a vector. But it can be "represented" by one. If you are dealing with planar regions in three dimensions, then it can be convenient to represent the "area" as a vector whose length is the actual scalar area and whose direction is perpendicular to the plane.

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Answers 11 Comments 2 Lesson Posted 5 days ago Schools/State Board Schools CBSE/Class 10

Saranya

I completed B.sc Mathematics in Quaid e Millath govt college for women. I am taking tuition at Home....

Hello everybody, State Board maths is really very very easy. It is really easy to score 100. First concentrate every example sums. If learn that example sums definitely you can understand your exercise sums. You need to write every exams in the following order : 1. 10 Mark Questions 2. 5 Mark... read more

Hello everybody,

State Board maths is really very very easy. It is really easy to score 100.

First concentrate every example sums.

If learn that example sums definitely you can understand your exercise sums.

You need to write every exams in the following order :

1. 10 Mark Questions

2. 5 Mark Questions

3. 2 mark questions

4. 1 mark question

Don't leave any questions you can attend every question.

Remember every formulas. Daily 1 hour you have to spend for maths subject.

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Lesson Posted on 01 Jun Indices CBSE/Class 9/Mathematics Schools/ICSE Schools

Drishti Roy

I have taught primary school students for 2 years. I specialize in Mathematics, Physics and Chemistry...

LOGARITHMIC FUNCTIONS A logarithm is an exponent used in mathematical calculations to depict the perceived levels of variable quantities such as visible light energy, electromagnetic field strength, and sound intensity. Suppose three real numbers a, x, and y are related according to the following equation: x... read more

**LOGARITHMIC FUNCTIONS**

A logarithm is an exponent used in mathematical calculations to depict the perceived levels of variable quantities such as visible light energy, electromagnetic field strength, and sound intensity.

Suppose three real numbers a, x, and y are related according to the following equation:

x = ay

Then y is defined as the base-a logarithm of x. This is written as follows:

loga x = y

As an example, consider the expression 100 = 102. This is equivalent to saying that the base-10 logarithm of 100 is 2; that is, log10 100 = 2. Note also that 1000 = 103; thus log10 1000 = 3. (With base-10 logarithms, the subscript 10 is often omitted, so we could write log 100 = 2 and log 1000 = 3). When the base-10 logarithm of a quantity increases by 1, the quantity itself increases by a factor of 10. A 10-to-1 change in the size of a quantity, resulting in a logarithmic increase or decrease of 1, is called an order of magnitude. Thus, 1000 is one order of magnitude larger than 100.

Base-10 logarithms, also called common logarithms, are used in electronics and experimental science. In theoretical science and mathematics, another logarithmic base is encountered: the transcendental number e, which is approximately equal to 2.71828. Base-e logarithms, written loge or ln, are also known as natural logarithms. If x = ey, then

loge x = ln x = y

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Comments Asked on 01 Jun Schools/Play Schools

Looking for play school teachers for a new play school in Vadavalli, Coimbatore. Any leads welcome.

Answer

Asked on 21 May CBSE/Class 6 CBSE/Class 1 CBSE/Class 2

How to find the students who need home tuition or can come at my home for tuition

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Asked on 12 May Schools/ICSE Schools

I am looking for a tutor who can teach a class IV, ICSE student Social studies at her residence, thrice... read more

I am looking for a tutor who can teach a class IV, ICSE student Social studies at her residence, thrice a week. Kindly mention the expected fees.

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Answered on 11 Jul Tuition Fee Schools/CBSE Schools CBSE/Class 3

Rajee Subramanian

Tutor

600rs per month

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Answers 3 Comments Answered on 11 Apr Tuition Schools/ICSE Schools Tuition/Class I-V Tuition

Meenakshi Krishnamurthy

Tutor

Hi Sapna , I think this is too early to keep tuitions for a second standard child . Instead you can teach him everyday one hour because syllabus will not be that heavy and teaching will make the bonding between parents and child more understanding and happier . read more

Hi Sapna , I think this is too early to keep tuitions for a second standard child . Instead you can teach him everyday one hour because syllabus will not be that heavy and teaching will make the bonding between parents and child more understanding and happier .

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Lesson Posted on 28 Feb CBSE/Class 11/Commerce/Economics Tuition/BBA Tuition/Micro and Macro Economics Tuition/BCom Tuition/Micro & Macro Economics

Factors affecting Demand-CBSE/NCERT, Class 12/StdXII/SYJC/HSC, ICSE Micro-Economics

Rajiv Vadera

I am MBA Finance. I believe in conceptual learning and not just theoretical.

What are the factors that affect demand?

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