Which of the following letter clusters will replace the question mark (?) and complete the following letter-cluster series?
UH, BD, IA, PY,?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. WX.
U + 7 = B, B + 7 = I, I + 7 = P, P + 7 = W
H - 4 = D, D - 3 = A, A - 2 = Y, Y - 1 = X