Question

Three unbiased coins are tossed simultaneously then the probability of getting atmost one head is

Answer 1

Possible outcomes = HHH, HHT, HTH, THH, TTT, TTH, THT, HTT

No. of possible outcomes = 8

Favourable outcomes = TTT, TTH, THT, HTT

No. of favourable outcomes = 4

Probability = No. of favourable outcomes/ No. of possible outcomes

Probability= 4/8

= 1/2

✓ at most means maximum