Two integers are selected at random from the set {1,2,…………..,11}. Given that the sum of selected numbers is even, the conditional probability that both the numbers are even is

Two numbers are selected at random from the set {1,2,3,....,13} . If the sum of the selected numbers is even, the probability that both the numbers are odd is

Two different numbers are selected at random from the set S={1, 2, 3, ……10}, then the probability that sum of selected numbers is divisible by 2 a/b, where a and b are co-prime then b is equal to ___.

The sum of two even number is an even number.

A number is selected at random from the set {1, 2, 3, …, 50}. The probability that it is a prime, is

Three different numbers are selected at random from the set A=(1,2,3,...,10) The probability that the product of two of the numbers is equal to the third is

Three numbers are selected at random without replacement from the set of numbers {1, 2, 3, … n}. The conditional probability that the 3rd number lies between the 1st two. If the 1st number is known to be smaller than the 2nd, is

Two integers are selected at random from the integers 1 to 9. If their sum is even, then find the probability that both integers are odd.

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