Directions: Select the missing number from the given series. 1, 9, 25, ?, 361, 841, 1681

The given series consists of perfect squares. The terms can be written as 1 squared, 3 squared, 5 squared, and so on, up to 41 squared. To find the missing fourth term, we square 7, which gives 49; squaring 9 gives 81, squaring 11 gives 121, and squaring 13 gives 169. The missing number is 169.

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