Question

The sum of two consecutive triangular number is a perfect square.​

Answer 1

Answer:

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Step-by-step explanation:

the sum of any two consecutive triangular numbers is a perfect square. For example, the following figure shows the the square number S9 can be written as a sum of two triangular numbers t9 and t8. 15,21,28 are three consecutive triangular numbers whose sum is a perfect square.

Answer 2

Answer:

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Step-by-step explanation:

the sum of any two consecutive triangular numbers is a perfect square. For example, the following figure shows the the square number S9 can be written as a sum of two triangular numbers t9 and t8. 15,21,28 are three consecutive triangular numbers whose sum is a perfect square.

Step-by-step explanation: