Army Group X Solved Paper

Total methods of thrice tossed of a coin
[HHH, HHT, HTH, THH, HTT, THT, TTH, TTT]
i.e. total number of possible outcomes n(S)=8
Favourable methods of come 1 and 2 Head in thrice tossed.
[HTT, THT, TTH, HHT, HTH, THH]
i.e. number of favourable outcomes
n(E)=6
∴ Required probability =‌

n(E)

n(S)

=‌

6

8

=‌

3

4