Answer the question:
Can a triangular number be a square number? Explain.

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Solution

Yes, a triangular number can be written in the form of a square.
Example: $36$
It can be written as a triangular number as $36 = 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8$ .
It can also be written in square number as $36 = 6 \times 6$ .

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