The sum of numbers from 300 to 700 which are divisible by 3 or 5 is?
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➯L.C.M of 3 and 5 is 15..
➯There difference of 300 and 700 is 400
➯400/15 = 17 numbers are there
➯the numbers are 300, 315,330....upto....690
➯The sum of the first n terms in an arithmetic
sequence is (n/2)⋅(a₁+aₙ).
= 17/2 (300+690)
= 8415.....
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