This is a bit of a guess, but I think probably a) +4 and also a) -215
7 over 21 . because you add 7 plus 8 plus 6 and get 21 then have 7 white shirts
Given expression is 35, 36, 37, 38...
First term a = 35
Common difference d = 36-35 = 1
Nth term of arithmetic sequence is:


To find the 100th term, substitute n = 100


Correct option is B