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4/4 Number series

Find the missing number: 9, 25, 49, 81, ?, 169

Odd numbers are involved.

Squares are also involved.

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What is ziuq spelt backwards?

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Miltonsays...

Explanation: sequence of square odd numbers.

9 (3x3),25 (5x5),49 (7x7),81 (9x9),121 (11x11),169 (13x13)...

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