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Q.

What is the probability that a number picked from the first twenty natural numbers is an even composite number?

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a

9/20

b

9/21

c

9/22

d

9/25

answer is A.

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Detailed Solution

Composite numbers are the number which can be divided by the a number other than 1 and itself while the even numbers are those which ends with 0, 2, 6, 4 or 8. So, even composite numbers in first twenty natural numbers are,
4, 6, 8, 10, 12, 14, 16, 18, 20
These are total 9 even composite numbers while total numbers are 20.
As we know that,
Probability = favorable outcome/ total outcome.
So, probability that the number is even composite number from the first twenty natural numbers,

P = \frac{9}{20}

The Correct Answer is 1.

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