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Properties of Square Numbers

Find the sum ...

Question

Find the sum of the first three even triangular numbers.

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Q. Find the sum of the first n even natural numbers. Hence find the sum of the first 20 even natural numbers.

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Q. Find the sum first three triangular numbers.

Q. Find the sum of the first three triangular numbers and check whether the sum is a triangular number or not.

Q. Find the sum of the first three triangular numbers and check whether the sum is a triangular number or not.

A. 12,Yes

B. 12, No

C. 10, Yes

D. 10, No

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