P Q O R N ?
Explanation:
The pattern here is +1, -2, +3, -4 and so on.
∴ Missing term is N + 5 = S.
Alternately,
P, O, N and so on, i.e., reverse order
There are two series here, Q, R and so on
∴ The missing term is S.
Hence, option (a).
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