Question
Select the letter that can replace the question mark in
the following series. PQO, QRP, RSQ, ?Solution
P + 1 = Q, Q + 1 = R, R + 1 = S Q + 1 = R, R + 1 = S, S + 1 = T O + 1 = P, P + 1 = Q, Q + 1 = R
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