In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R). Choose the correct option: 
 
Assertion (A) : Three unbiased coins are tossed together, then the probability of getting exactly \(2\) heads is \(\frac{3}{8}\).
 
Reason (R) : Favourable number of outcomes do not lie in the sample space of total number of outcomes.