# Three unbiased coins are tossed. What is the probability of getting at most two heads ?

Three unbiased coins are tossed. What is the probability of getting at most two heads ?

A. 3/4

B. 1/4

C. 3/8

D. 7/8

### **Answer : ** D. 7/8...

## Explanation:

Here, S = {TTT, TTH, THT, HTT, THH, HTH, HHT, HHH}

Let E = event of getting at most two heads.

Then E = {TTT, TTH, THT, HTT, THH, HTH, HHT}

P(E) = n(E)/n(S)

= 7/8.