Find the sum `(2 + 2^2 + 2^3 + 2^4 + ............+ 2^10)`
( 6 + 15 + 24 + 37 + ........................+ 105 ) = ?
Find the sum of all even natural numbers less than 75.
How many natural numbers between 17 and 80 are divisible by 6 ?
Find the remainder when `2^31 ` is divided by 3. ?