Which of the following letter-number clusters will replace the question mark (?) in the given series to make it logically complete?
EJM 13, FKN 15, GLO 17, HMP 19, ?​

Given: EJM 13, FKN 15, GLO 17, HMP 19, ?​

Logic: Letters are increasing + 1 and number is increasing + 2 place.

For, letter

E + 1 = F, F + 1 = G, G + 1 = H, H + 1 = I

J + 1 = K, K + 1 = L, L + 1 = M, M + 1 = N

M + 1 = N, N + 1 = O, O + 1 = P, P + 1 = Q

For, number

13 + 2 = 15, 15 + 2 = 17, 17 + 2 = 19, 19 + 2 = 21

So, the missing term is INQ 21.

Thus, correct option is (b).