# A coin is tossed twice, what is the probability that at least one tail occurs?

**Solution:**

When a coin is tossed twice, the sample space is given by

S = {HH, HT, TH, TT}; n (S) = 4

Let A be the event of the occurrence of the least one tail.

Accordingly, A = {HH, HT, TH, TT}; n (A) = 3

Therefore, the required probability is,

P(A) = n (A)/n (S)

= 3/4

NCERT Solutions Class 11 Maths Chapter 16 Exercise 16.3 Question 2

## A coin is tossed twice, what is the probability that at least one tail occurs?

**Summary:**

When a coin is tossed twice, the probability that at least one tail occurs is 3/4