From first 20 natural numbers if two numbers are selected at random then the probability of selecting them which are not conservative is

From first 20 natural numbers if two numbers are selected at random then the probability of selecting them which are not consecutive is

From first 100 natural numbers five are selected at random. Find the probability that all the five are not consecutive

From first 100 natural numbers five are selected at random. Find the probability that no two of them are consecutive

From first twenty natural numbers, 2 numbers are selected at random, the probability that the selected numbers are such that their sum is even is

From the set of numbers {1,2,3,...,10} , 4 numbers are selected at random. The probability that all of the selected numbers are consecutive is

A weighted coin with the probability of showing a head is (2)/(3) is tossed. If head appears, then a number is selected from the the first 20 natural numbers otherwise a number is selected from the first 9 natural numbers. The probability of getting an even number is

A weighted coin with the probability of showing a head is (2)/(3) is tossed. If head appears, then a number is selected from the the first 20 natural numbers otherwise a number is selected from the first 9 natural numbers. The probability of getting an even number is

From a set of 20 cards numbered from 1 to 20 one is drawn at random. Then the probability of selecting that the number is divisible by 3 or 5 is