Find the sum of all natural numbers between 100 and 1000 which are multiples of 7.

Find the sum of all natural numbers between 100 and 1000 which are multiples of 6.

Find the sum of all natural numbers between 100 and 1000 which are multiples of 5.

Find the sum of all natural numbers between 100 and 1000 which are multiple of 5.

Find the sum of all natural numbers between 100 and 1000 which are multiple of 5.

Find the sum of all natural numbers between 200 and 1000 which are multiples of 10.

Find the sum of all natural numbers between 1 and 100 which are multiples of 3.

Find the sum of all natural numbers between 100 and 1000 which is a multiple of 5.

Find the sum of all natural numbers between 99 and 1001 which are multiples of 5.

(i) Find the sum of odd integers from 1to 2001. (ii) Find the sum of all natural numbers between 99 and 1001, which are multiples of 5.