In a function they are distributing noble prize. In how many ways can 2 prizes be distributed among 9 boys when a boy gets any no. of prizes?  Choose the correct choice from the following answers:
A) 36  B) 42  C) 81  D) 69  E) 70
Ans.(C)   Sol. In this case, repetitions are allowed, so all the 2 prizes can be given in 9 ways, i.e. (9 x 9) ways = 92 ways = 81 ways Or nr ways = 92 ways = 81 ways
<result>C</result>
In a function they are distributing noble prize. In how many ways can 2 prizes be distributed among 9 boys when a boy gets any no. of prizes?