Which of the following letter-number clusters will replace the question mark (?) in the given series to make it logically complete?
LEJ21, MFK32, NGL43, OHM54, ?

Given: LEJ21, MFK32, NGL43, OHM54, ?

Logic: Letters are increasing + 1 and numbers are increasing + 11 place.

For, letter

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

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

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

For, number

21 + 11 = 32, 32 + 11 = 43, 43 + 11 = 54, 54 + 11 = 65

So, the missing term is PIN65.

Thus, correct option is (b).