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Probability

Short Answer Type

831. A coin is tossed. If head comes up, a die is thrown but if tail comes up, the coin is tossed again. Find the probability of obtaining head and an even number.

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Long Answer Type

832.

A bag contains 8 marbles of which 3 are blue and 5 are red. One marble is drawn at random, its colour is noted and the marble is replaced in the bag. A marble is again drawn from the bag and its colour is noted. Find the probability that the marbles will be
(i) blue followed by red (ii) blue and red in any order (iii) of the same colour.

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Short Answer Type

833. Two cards are drawn one by one without replacement from a well shuffled pack of 52 cards. What is the probability that one is a red card and the other is a black card?

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834. Two cards are drawn one by one without replacement from a well shuffled pack of 52 cards. What is the probability that one of the cards drawn is a king and the other a queen of the same suit?

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835.

A bag contains 4 white balls and 2 black balls. Another bag contains 3 white balls and 5 black balls. If one ball is drawn from each bag, find the probability that both are black.

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836. An urn contains 25 balls numbered 1 to 25. Two balls are drawn from the urn with replacement. Find the probability of getting both odd numbers.

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837. An urn contains 25 balls numbered 1 to 25. Two balls are drawn from the urn with replacement. Find the probability of getting one odd and one even number.

Total number of balls = 25
∴ Total number of cases = 25
Let E denote the event of drawing even numbered ball and O denote the event of drawing odd numbered ball.
Number of balls numbered odd = 13
Number of balls numbered even = 12
$therefore space space space space space space space space space straight P left parenthesis straight E right parenthesis space equals space 12 over 25 comma space space straight P left parenthesis straight O right parenthesis space equals space 13 over 25$

$therefore space space straight P left parenthesis one space odd space and space one space even right parenthesis space equals space straight P left parenthesis OE space or space EO right parenthesis space equals space straight P left parenthesis straight O right parenthesis space straight P left parenthesis straight E right parenthesis space plus space straight P left parenthesis straight E right parenthesis space straight P left parenthesis straight O right parenthesis space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space 13 over 25 cross times 12 over 25 plus 12 over 25 cross times 13 over 25 space equals 312 over 625$

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838. An urn contains 25 balls numbered 1 to 25. Two balls are drawn from the urn with replacement. Find the probability of getting at least one odd number .

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839. An urn contains 25 balls numbered 1 to 25. Two balls are drawn from the urn with replacement. Find the probability of getting no odd number.

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840. Three cards are drawn successively, without replacement from a pack of 52 well shuffled cards. What is the probability that first two cards are kings and the third card drawn is an ace?

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