Question

when a fair coin is tossed thrice the probability of obtaining head at most twice is​

Answer 1

Answer:

Probability of obtaining head at most twice is=1−when all are heads (H,H,H)

=1−

8

1

=

8

7

[Favorable cases are: (T,T,T),(T,T,H),(T,H,T),(H,T,T),(H,H,T),(H,T,H),(T,H,H)