Five sticks of length 1, 3, 5, 7 and 9 feet are given. Three of these sticks are selected at random. What is the probability that the selected sticks can from a triangle?

(n>=5) persons are sitting in a row. Three of these are selected at random. The probability that no two of the selected persons sit together is

(n>=5) persons are sitting in a row. Three of these are selected at random. The probability that no two of the selected persons sit together is

(n>=5) persons are sitting in a row. Three of these are selected at random. The probability that no two of the selected persons sit together is

(n>=5) persons are sitting in a row. Three of these are selected at random. The probability that no two of the selected persons sit together is

Triangles are formed by joining vertices of an octagon. Any one of those triangle is selected at random. What is the probability that the selected triangle has no side common with the octagon?

A number is selected at random from the numbers 1 to 30. What is the probability that the selected number is a prime number?

(n>=5) persons are sitting in a row.Three of these are selected at random.The probability that no two of the selected persons sit together is

From each of three married couples one of the partners is selected at random.Find the probability that the selection consists of two men and a woman.

Out of 8 points in a plane,5 are collinear.Find the probability that 3 points selected a random will form a triangle.