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 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 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 integers are selected at random from integers 1 through 11. If the sum is even,find the probability that both the numbers are odd.

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.

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

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 ___.

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

Two integers are selected at random from the integers 1 to 11. If their sumis even find the proabability 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