Find the number of all 3-digits even natural numbers.

Find the sum of first hundred even natural numbers divisible by 5.

Statement 1 The difference between the sum of the first 100 even natural numbers and the sum of the first 100 odd natural numbers is 100. Statement 2 The difference between the sum opf the first n even natural numbers and sum of the first n odd natural numbers is n.

Let n denote the number of all n-digit positive integers formed by the digits 0, 1 or both such that no consecutive digits in them are 0. Let b_n = the number of such n-digit integers ending with digit 1 and c_n = the number of such n-digit integers ending with digit 0. The value of b_6 , is

Find the number of 4-digit numbersthat can be formed using the digits 1, 2, 3, 4, 5 if no digit is repeated. How many of these will be even?

Find the arithmetic mean of first ten even natural numbers.

Whether the following is empty (null) set? Set of all even natural numbers divisible by 5.

A= { x: x is a natural number} B= {x: x is an even natural number} find A intersection B

Find the sum of all 3-digit numbers which leave remainder 2, when divided by 5.

Find the sum of all natural numbers below 500 which are divisible by 8.

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