Which one of the following cannot be the square of a natural number?

Which of the following is a prime number?

What are the two natural numbers whose product is 2400 and the sum of whose squares is 5200?

The sum of first 45 natural numbers is:

It is given that 5 does not divide n - 1, n and n + 1, where n is a positive integer. Which one of the following is correct?

Consider the following statements: I. Two consecutive natural numbers are always co-prime. II. If m and n are relatively prime, then m × n is always even. Which of the statements given above is/are c…