1, 25, ?, 361, 841, 1681

Solution

Expression : 1, 25, ?, 361, 841, 1681

The pattern followed is that there is a difference of consecutive even numbers between the square roots of above numbers.

$$(1)^2=1$$

$$(5)^2=25$$

$$(11)^2=121$$

$$(19)^2=361$$

$$(29)^2=841$$

$$(41)^2=1681$$

=> Ans - (D)

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