Which of the following letter-number clusters will replace the question mark (?) in the given series?
UDF6, VFI9, ?, XJO15, YLR18, ZNU21
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. WHLI12.
Given series: UDF6, VFI9, ?, XJO15, YLR18, ZNU21
U + 1 = V, V + 1 = W, W + 1 = X, X + 1 = Y, Y + 1 = Z
D + 2 = F, F + 2 = H, H + 2 = J, J + 2 = L, L + 2 = N
F + 3 = I, I + 3 = L, L + 3 = O, O + 3 = R, R + 3 = U
6 + 3 = 9, 9 + 3 = 12, 12 + 3 = 15, 15 + 3 = 18, 18 + 3 = 21