question_answer

Average of n numbers is a. The first number is increased by 2, second one is increased by 4, the third one is increased by 8 and so on. The average of the new number is

A)  \[a+{{2}^{n+1}}/n\]             

B)  \[a+({{2}^{n}}-1)/n\]

C)  \[a+2\,({{2}^{n}}-1)/n\]

D)  \[a+({{2}^{n+1}}-1)/n\]

E)  None of these