Which letter-cluster will replace the question mark (?) to complete the given series?
OEST, QGQR, SIOP, ?, WMKL
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. UKMN.
Given series: OEST, QGQR, SIOP, ?, WMKL
O + 2 = Q; Q + 2 = S; S + 2 = U; U + 2 = W
E + 2 = G; G + 2 = I; I + 2 = K; K + 2 = M
S - 2 = Q; Q - 2 = O; O - 2 = M; M - 2 = K
T - 2 = R; R - 2 = P; P - 2 = N; N - 2 = L