Which of the following letter-number clusters will replace the question mark (?) in the given series to make it logically complete?
UKM 1, SML 3, QOK 9, OQJ 27, ?

Correct option is B

Given:
UKM 1, SML 3, QOK 9, OQJ 27, ?

Logic:
Numbers are 3 times of previous numbers.
first letter decreased by 2.
second letter increased by 2 and third letter decreased by 1.

Analyzing the number pattern:
1 → 3 → 9 → 27

The numbers follow a clear pattern of multiplying by 3:
1×3=3
3×3=9
9×3=27
Therefore, the next number in the sequence will be 27×3=81

first letter
U - 2 = S, S - 2 = Q, Q - 2 = O, O - 2 = M

Second letter
K +2 = M, M + 2 = O, O + 2 = Q, Q + 2 = S

Third letter
M - 1= L, L -1 = K, K - 1= J, J - 1= I

Final term = MSI 81

Option B is correct.