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 number a and b 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 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 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 two numbers a and b are-chosen at random from the 1st 30 natural numbers, find the probability that the expresion (a^2 -b^2) is divisible by 3.

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

Three distinct numbers are chosen at random from the first 15 natural numbers. The probability that the sum will be divisible by 3 is

Three distinct numbers are chosen at random from the first 15 natural numbers. The probability that the sum will be divisible by 3 is

Two natural numbers x and y are chosen at random from the set {1,2,3,4,...3n}. find the probability that x^(2)-y^(2) is divisible by 3.