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1. 4, 9, 25, ?, 121, 169, 289, 361
i.e. 22, 32, 52,.....,
112, 132, 172, 192.
So, missing term = 72 = 49.
Solution:
The given series consists of squares of consecutive prime numbersi.e. 22, 32, 52,.....,
112, 132, 172, 192.
So, missing term = 72 = 49.