question_answer

The income of HBI on the nth day \[Rs\,({{n}^{2}}+2)\] and the expenditure of HBI on the nth day is\[Rs\,(2n+1)\].

Also Income = Expenditure + Savings

In how many days his total savings will be Rs.1240?

A)  10                   

B)  12           

C)  15                   

D)  16