Question

Two coins are tossed simultaneously for 360 times. The number of times ‘2 Tails’ appeared was three times ‘No Tail’ appeared and the number of times ‘1 Tail’ appeared is double the number of times ‘No Tail’ appeared. Find the probability of getting ‘Two tails’.

• A. 0.25
• B. 1
• C. 0.5
• D. 2

Answer 1

The correct option is C 0.5

Let no. of times 'No Tail' appeared be x.
No. of times '1 Tail' appeared = 2x.
No. of times '2 Tails' appeared = 3x.
x + 2x + 3x = 360
$\Rightarrow x=60$
No. of times '2 Tails ' appeared = 180
Then, $\text{P(Getting 2 Tails})=\frac{180}{360}=0.5$