An urn contains 6red, 5 blue and 2 green marbles. If three marbles are picked at random, what is the probability that at least one is blue?

28/143

115/197

28/197

115/143

Correct Answer : D

The probability that a student is not a swimmer is 1/5. Then the probability that one of the five students, four are swimmers is:

What is the probability of getting a sum 9 from two throws of a dice?

Sum of digits of a 5 digit number is 41. Find the probability that such a number is divisible by 11?