Question

If three unbiased coins are tossed simultaneously, then the probability of exactly two tails is?
1. 3/8
2. 5/8
3. 1/8
4. 7/8
5. 1/4

Answer 1

Correct Answer - Option 1 : 3/8

CONCEPT:

When 'n' coins are tossed total outcomes are 2ⁿ.

FORMULA USED:

P = Favorable outcomes/Total outcomes

CALCULATION:

Total outcomes for 3 coins = 2³ = 8

Favorable outcomes = (TTH, THT, HTT)

Required P = 3/8

∴ The probability is 3/8.