Question

find the sum of all natural numbers less than 200 which are divisible by 5

Answer 1

Heya mate, Here is ur answer

AP: 5 , 10 , 15 ........195 .

a=5

d=10-5

d=5

an=195

a+(n-1)d =195

5+(n-1)×5 =195

(n-1) ×5=195-5

(n-1) ×5 =190

n-1 =190/5

n-1= 38

n=38+1

n=39 .

Sn= n/2(a+an)

=39/2(5+195)

=39/2×200

=39×100

=3900

So, the sum of all natural numbers less than 200 which are divisible by 5 is 3900.

Warm regards

@Laughterqueen

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