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4, 9, 25, ?, 121, 169, 289, 361
Options:
A .  49
B .  64
C .  81
D .  87
Answer: Option A
The given series consists of squares of consecutive prime numbers
i.e. 22, 32, 52,.....,
112, 132, 172, 192.
So, missing term = 72 = 49.

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