Question 368927

exactly 3 heads means  3 times head and 3 times tail.


it can be solved by binomial probability.

probability of getting head in one toss = 1/2


and probability of getting tail in one toss = 1/2


required probability =  6C3 * (1/2)^3 * (1/2)^3 


= 20 * 1/8 * 1/8 

 
= 5/16