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CBSE Class 10 Answered

Find the sum, of all natural number between 1 and 100 which is divisible by 3 and 5 both. Also show how the number divisible by 3 and 5 is found out?
Asked by | 26 Feb, 2012, 07:25: PM
answered-by-expert Expert Answer
Numbers divisible by 3 and 5 both means numbers divisible by 3*5 = 15
So the numbers are 15, 30, 45, ... ,90
Here, a = 15, d = 15 and n = 6
Thus, Sum = (6/3)[30 + 5*15] = 2*105=210
Answered by | 27 Feb, 2012, 09:15: AM

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