Math, asked by nunumanjeri8353, 1 year ago

Find the sum of all intrgers between 50 and 500 ,which are divisible of 7

Answers

Answered by justusshajo288
1

The arithmetic series is 56+63+70+77+....+448

a=56 ,d=7 ,l=448

Number of terms n=l-a/d+1

n=448-56/7+1

=392/7+1

=56+1

=57


Sn=n/2(a+l)

S =57/2(56+448)

57

=57/2(504)

=57(252)

=14364


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