Instructions
A series is given, with one term missing. Choose the correct alternative from the given ones that will complete the series.
Solution
361, ?, 169, 121, 49, 25
$$19^2$$, ?, $$13^2$$, $$11^2$$, $$7^2$$, $$5^2$$
The given series is square of prime numbers decreasing left to right
$$\therefore\ $$The required number = $$17^2$$ = 289
Hence, the correct answer is Option A
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