79. Exemplar Exercise Problem XXXVIII

In a game, the entry fee is Rs 5. The game consists of a tossing a coin 3 times. If one or two heads show, Sweta gets her entry fee back. If she throws 3 heads, she receives double the entry fees. Otherwise she will lose. For tossing a coin three times, find the probability that she

1. loses the entry fee.

2. gets double entry fee.

3. just gets her entry fee.

 

 

The probability that she loses the entry fee is  $\frac{i}{i}$.