Out of 3n consecutive integers, three are selected at random. Find the probability that their sum is divisible by 3.

Out of 3n consecutive integers, there are selected at random. Find the probability that their sum is divisible by 3.

If out of 20 consecutive whole numbers two are chosen at random, then find the probability that their sum is odd.

Two integers are chosen at random and multiplied. Find the probability that the product is an even integer.

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.

An integer is chosen at random and squared. Find the probability that the last digit of the square is 1 or 5.

Five different digits from the set of numbers {1, 2, 3, 4, 5, 6, 7} are written in random order. Find the probability that five-digit number thus formed is divisible by 9.

Statement 1: Out of 5 tickets consecutively numbered, three are drawn at random. The chance that the numbers on them are in A.P. is 2/15. Statement 2: Out of 2n+1 tickets consecutively numbed, three are drawn at random, the chance that the numbers on them are in A.P. is 3n//(4n^2-1)dot

A number is selected from the seet {1,2,3,. . . . . . 20} The probability that the selected number is divisible by 3 or 4 is ________