Instructions

A series is given, with one term missing. Choose the correct alternative from the given ones that will complete the series.

Question 7

361, ?, 169, 121, 49, 25.

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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