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Square Numbers

  • If we add two consecutive triangular numbers, then we obtain a square number.

For example, 10 + 15 = 25 = 52

21 + 28 = 49 = 72

  • The sum of first n odd natural numbers is n2.

For example, the sum of first 7 odd natural numbers is 49 i.e., 1 + 3 + 5 + 7 + 9 + 11 + 13 = 49…

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