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12. Probability
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Q12 of 54 Page 314

A two digit number is formed with the digits 2, 5, 9 (repetition is allowed). Find the probability that the number is divisible by 2 or 5.

Since repetition is allowed, the number of 2 digit numbers formed




If a number is divisible by 2 or 5 the unit place should be 2 or 5. Thus probable no of words


Probability



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10

A card is drawn at random from a well-shuffled deck of 52 cards. Find the probability that it will be a spade or a king.

11

A box contains 10 white, 6 red and 10 black balls. A ball is drawn at random. Find the probability that the ball drawn is white or red.

13

Each individual letter of the word “ACCOMMODATION” is written in a piece of paper, and all 13 pieces of papers are placed in a jar. If one piece of paper is selected at random from the jar, find the probability that

(i) the letter ‘A’ or ‘O’ is selected.


(ii) the letter ‘M’ or ‘C’ is selected.

14

The probability that a new car will get aaward for its design is 0.25, the probability that it will get an award for efficient use of fuel is 0.35 and the probability that it will get both the awards is 0.15. Find the probability that

(i) it will get atleast one of the two awards


(ii) it will get only one of the awards.

Questions · 54
12. Probability
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