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# Someone is asked to take a number from 1 to 100. The probability that it is a prime is

a. 1/5

b. 6/25

c. 1/4

d. 13/50

**Solution:**

Probability can be defined as the ratio of the number of favorable outcomes to the total number of outcomes of an event.

We know that

Total number of outcomes = 100

Prime numbers between 1-100 are

2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 57, 61, 67, 71, 73, 79, 83, 89 and 97.

So the probability that it is a prime = Favourable outcomes/ Total outcomes

Substituting the values

= 25/100

= 1/4

Therefore, the probability that it is a prime is 1/4.

**✦ Try This: **Someone is asked to take a number from 1 to 50. The probability that it is a prime is

**☛ Also Check: **NCERT Solutions for Class 10 Maths Chapter 14

**NCERT Exemplar Class 10 Maths Exercise 13.1**** Problem 25**

## Someone is asked to take a number from 1 to 100. The probability that it is a prime is a. 1/5, b. 6/25, c. 1/4, d. 13/50

**Summary:**

Someone is asked to take a number from 1 to 100. The probability that it is a prime is 1/4

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