What letter replaces '?' in the stack? How do you arrive at it?
Source: CSIR NET December 2018 QP
It's
Z
.
There are patterns which we need to see.
E = 5, O = 15 so the difference is 10.
P = 16, so Z = 26.
G = 7, J = 10, the difference is 3.
R = 18, so adding 3 would be 21 which is U.
F = 6, K = 11, difference = 5.
Q = 17, so adding 5 would be 22 which is V