Five non-similar pairs of socks are in a closet. Four socks are selected at random. What is the probability that there will be among the four socks chosen
no complete pair?

Five non-similar pairs of socks are in a closet. Four socks are selected at random. What is the probability that there will be among the four socks chosen exactly one complete pair?

A bag contains twelve pairs of socks and four socks are picked up at random. The probability that there is at least one pair is equal to -

An urn contains three white, six red and four black balls. Two balls are selected at random. What is the probability that one ball is red and other is white, given that they are of different colour ?

Five cards-the ten, jack, queen, king and ace of diamonds, are well-shuffled with their face downwards: One card is selected at random. (i) What is the probability that the card is the queen? (b) If the queen is selected and put aside (without replacement), what is the probability that the second card selected is (a) an ace? (b) a queen?

A number is chosen at random among the first 120 natural numbers. What is the probability that the number chosen being a multiple of 5 or 15 ?

What is the probability that a non leap year selected at random will contain 53 sundays?

There are two red, two blue, two white, and certain number (greater than 0) of green socks in a drawer. If two socks are taken at random from the drawer without replacement, the probability that they are of the same color is 1//5 , then the number of green socks are _______.

If four vertices a regular octagon are chosen at random, then the probability that the quadrilateral formed by them is a rectangle is

From 100 tickets numbered 1, 2,3.. ..... 100.four are drawn at random. What is the probability that 2 of them will bear numbers from1 to 40 and the other 2 will- bear any number from 41 to 100?

A closet has 5 pairs of shoes. The number of ways in which 4 shoes can be chosen from it so that there will be no complete pair is