The sum of first 40 posituve intiger dividible by 6 is
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The positive integers that are divisible by 6 are
6, 12, 18, 24 …
It can be observed that these are making an A.P. whose first term is 6 and common difference is 6.
a = 6 , d = 6 , S(40) =? & l = 240
S(40) = 40/2 (6+240) = 20 × 246
= 4920.
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we have to find s40 when a is 6 and d is 6
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