Question

14. Find the sum of integers from 1-50 which are divisible by 2 and 5
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Answer 1

sum of all integers from 1 to 50 divisible by 2

2 + (n –1) 2 = 50

2n=50

n=25

sum of all integers from 1 to 50 divisible by 2

=[(25-1)2+2]25/2

=52×25/2

=26×25

=650

similarly sum of all integers from 1 to 50 divisible by 5

=5+(n-1)5=50

n=10

sum of all integers from 1 to 50 divisible by 5

100

total is 750