Question

Find the sum of all no. divisible by 2 and 5 both form 1 to 5000.

Answer 1

Answer:

1,252,500

Step-by-step explanation:

Divisible by 2 and 5 both means Divisible by 10.

so we need the sum

10+20+30+40...5000

Now take 10 Common

=10(1+2+3+4...500)

The sum of the first n natural numbers is n(n+1)/2...so sum

=10(500.501)/2

=1,252,500