Question

A coin is tossed three times in succession. If E is the event that there are at least two heads and F is the event in which fast throw is a head, then =

• A. ¾
• B. 3/8
• C. ½
• D. 1/8

Answer 1

Answer: (A)

¾

Answer 2

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

n(5) = 4, n(F) = 4 and n(E∩F) = 3.

∴ P $\left( \frac { E } { F } \right) = \frac { P ( E \cap F ) } { P ( F ) } = \frac { 3 / 8 } { 4 / 8 } = \frac { 3 } { 4 }$