Three numbers are chosen from 1 to 20. Find the probability that they are consecutive.

Three numbers are chosen from 1 to 30. The probability that they are not consecutive is

Three numbers are chosen at random from 1 to 15. The probability that they are consecutive is

Three numbers are chosen from 1 to 8. Find the probability for the 3 chosen numbers to be not consecutive.

Two numbers are chosen from 1 to 5. The probability for the two numbers to be consecutive is

Three numbers are chosen at random from numbers 1to 30.Write the probability that the chosen number are consecutive.

Three numbers are chosen at random from numbers 1 to 30. The probability that the minimum of the chosen numbers is 9 and maximum is 25, is

There are 6 positive numbers and 8 negative numbers. Three numbers are chosen from them at random and multiplied. The probability that the product is a negative number is