We get a number when we add two consecutive triangular numbers.

triangular

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odd

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even

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square

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Solution

The correct option is D square
We get a square number when we add two consecutive triangular numbers.

For example:
We know that 3, 6, 10, ... are triangular numbers.
$3 + 6 = 9 = 3^{2}$
$6 + 10 = 16 = 4^{2}$

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