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Find the sum of first 80 natural number |
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Answer» A.P: 1,2,3,4.....80 a=1, d=1, n=80 a^n = a + (n-1)d = 1 + (80-1)1 = 1 + 79 = 80 S^n = n/2 (a + a^n) = 80/2 (1 + 80) = 3204 Hope it helps!!! :) |
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