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In following alphabet series , one term missing as shown by question mark . Choose missing term from options.

Z, S, W, O, T, K, Q, G, ?

Option:
A. N, C
B. N, D
C. O, C
D. O, D
Answer: A . N, C

Justification:

The given sequence consists of two series :
I.    Z, W, T, V, Q, ? in which each letter is moved three steps backward to obtain the next term.
II.   S, O, K, G in which each letter is moved four steps backward to obtain the next term.

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