Class 12

Math

Algebra

Probability I

If three squares are selected at random from chessboard, then the probability that they form the letter 'L' is

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A pack of 52 cards is divided at random into two equals parts. Find the probability that both parts will have an equal number of black and red cards.

A pack of playing cards was found to contain only 51 cards. If the first 13 cards, which are examined are all red, then the probability that the missing card is black is :-

A bag contains 3 white, 3 black and 2 red balls. One by one, three balls are drawn without replacing them. Find the probability that the third ball is red.

A box contains 3 blue, 2 white, and 4 red marbles. If a marble is drawn at random from the box, what is the probability that it will be(i) white? (ii) blue? (iii) red?

A bag contains a red ball, a blue ball and a yellow ball, all the balls being of the same size. Kritika takes out a ball from the bag without looking into it. What is the probability that she takes out the(i) yellow ball? (ii) red ball? (iii) blue ball?

A box contains 5 red marbles, 8 white marbles and 4 green marbles. One marble is taken out of the box at random. What is the probability that the marble taken out will be(i) red ? (ii) white ? (iii) not green?

The probabilities of three mutually exclusive events are 2/3, 1/4, and 1/6. Is this statement correct?

It is given that in a group of 3 students, the probability of 2 students not having the same birthday is 0.992. What is the probability that the 2 students have the same birthday?