Question

find the sum of integers from 1to 100 which are multiple of 2 and 5​

Answer 1

first we have to find out the multiples of2 and 5 from1 ti100....then find the sum

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Answer 2

AP formed will be

(10,20,30......100).

an=a+(n-1)d

100=10+(n-1)10

After solving

n=10

SN=n\2{2a+(n-1)d

Put the values

a=10,n=10,d=10

SN = 550 Ans