A pair of numbers is picked up randomly (without replacement) from the set {1,2, 3,5, 7, 11, 12, 13, 17, 19}. The probability that the number 11 was picked given that the sum of the numbers was even is nearly

Question : A pair of numbers is picked up randomly (without replacement) from the set {1,2, 3,5, 7, 11, 12, 13, 17, 19}. The probability that the number 11 was picked given that the sum of the numbers was even is nearly