pl help me out..i m confused

[kalyand022]

Sequence A is defined by the equation An = 3n + 7, where n is an integer greater than or equal to 1. If set B is comprised of the first x terms of sequence A, what is the median of set B ?

(1) The sum of the terms in set B is 275.

(2) The range of the terms in set B is 30.
Ans : D


if i take n=1, A=10....but if i take continous n=1,1,1,1 and 2,2,2, then how the ans will be D
cos it is not said that it is distinct.....i can take n=1 as many times .....
like for the second condition.
if n=1,..then A=10 and in ths way 13,16,.....upto 40.
so we get a median..
but what if 10,13,13,13,13,13,13,13,40 then median is changn..
pl explain......shall i need to thnk that n is distinct...ie there will be no repetation

[Carloblacksun]

if N=1 then A(N)=10..if N=2 then A(N) = 13 and so on...

A(N) = 10, 13, 16, 19.... then if the sum makes 275 it means that the maximum N = 11 (just try it) and the median is 25

same thing with statement 2, which tells us that the range is 30, which means the last term is 40! so the median is still 25..

Hence D