what is the sum of the first 30natural number
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The number series 1, 2, 3, 4, . . . . , 29, 30. Therefore, 465 is the sum of positive integers upto 30.
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a = 1
d = 1
Sum = n/2 × (a+l)
= 30(1+31)/2 = 30×31/2 = 465
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