Two numbers a and b are selected from the set of natural number then the probability that `a^2 + b^2` is divisible by 5 is

Two number a and b are chosen at random from the set of first 30 natural numbers. Find the probability that a^2-b^2 is divisible by 3.

Two numbers a and b are chosen at random from the set of first 30 natural numbers. The probability that a^(2)-b^(2) is divisible by 3 is

Two numbers a and b are chosen at random from the set of first 30 natural numbers. The probability that a^(2)-b^(2) is divisible by 3 is:

Two numbers are randomly selected from the first 100 natural numbers. The probability the product is divisible by 17 is

Two number aa n db aer chosen at random from the set of first 30 natural numbers. Find the probability that a^2-b^2 is divisible by 3.

Two number aa n db aer chosen at random from the set of first 30 natural numbers. Find the probability that a^2-b^2 is divisible by 3.

If a number is selected from the first 30 natural numbers, then the probability that the number selected is divisible by 4 or 7, is