Question

Question 9 Ifis the probability of an event, what is the probability of the event ‘not A’.

Class X1 - Maths -Probability Page 404

Answer 1

Q : - if 2/11 is the probability of an event, what is the probability of the events ' not A '

solution :-
∵ P( A ) + P( not A ) = 1
[ sum of event (A ) and it's complementary event ( not A ) is always 1 ]
∴ P( not A ) = 1 - P( A )
P( not A ) = 1 - 2/11 = 9/11