WHAT SQUARE NUMBER WE WILL GET IF WE ADD 8th and 9th triangular numbers
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The Triangular Number Sequence is 1, 3, 6, 10, 15, 21, 28, 36, 45 and so on. It is formed by counting the dots in a triangle.
From the sequence it is evident that the 8th and the 9th number is : 36 and 45.
The sum is 36 + 45 = 81 which is the square root of 9.
so the square number obtained is 81.(Ans)
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