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Find two triangular numbers after 21 and show each of 7 squareand 8 square as the sum of two triangular |
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Answer» Answer: Step-by-step EXPLANATION: 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.Jul 5, 2018 |
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