Which letter will replace the question mark (?) in the following series?
B11, F13, J17, N19, ?
Answer & explanation
Correct answer: option 3
According to the above alphabet position:
B11 ⇒ (2), 11
F13 ⇒ (6), 13
J17 ⇒ (10), 17
N19 ⇒ (14), 19
? ⇒ (18), 23 = R23
(add 4 in 1st alphabet position and there is Prime number series in 2nd alphabet position)