# If 2/11 is the probability of an event, what is the probability of the event ‘not A’

**Solution:**

It is given that

P (A) = 2/11

The sum of probabilities of an even to happen and not happen is always 1. i.e.,

P (A) + P (not A) = 1

Therefore,

P (not A) = 1 - P (A)

= 1 - 2/11

= 9/11

NCERT Solutions Class 11 Maths Chapter 16 Exercise 16.3 Question 9

## If 2/11 is the probability of an event, what is the probability of the event ‘not A’.

**Summary:**

If 2/11 is the probability of an event, what is the probability of the event ‘not A’ is 9/11