There is a box containing 30 bulbs of which 5 are defective. If two bulbs are chosen at random from the box in succession without replacing the first, what is the probability that both the bulbs chosen are defective?
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There are `12` pairs of shoes in a box. Then the possible number of ways of picking `7` shoes so that there are exactly two pairs of shoes are
Correct Answer - A `(a)` Selecting any two pairs, number of ways `=.^(12)C_(2)` Now we have to select remaining three shoes from `10` pairs such that no pair is selected. Three...
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Two squares of `1xx1` are chosen at random on a chestboard. What is the probability that they have a side in common ?
Correct Answer - A `(a)` Total number of ways of selecting two squares `"^(64)C_(2)=(1)/(2)(64xx63)=2016` If the first square happens to be any of the four corner ones, the second square can...
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A box has 100 bulbs out of which 10 are defective. The probability that out of a sample of 5 bulbs, none is defective, is
Correct answer is (C) (9/10)5
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There are two boxes, red and white in colour. The ratio of the number of chocolates in the white box to the number of biscuits in the red box is ` 3 :
Correct Answer - ` 18 : 13`
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In a box, there are 20 marbles. Each marble is marked with a distinct number from 1 to 20. Find the probability of drawing a marble from the box which
Correct Answer - `1//5`
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A card is drawn from a well-shuffled deck of 52 cards and without replacing this card, a second card is drawn. Find the probability that the first car
Correct Answer - `13/204`
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(i) A box contins 80 discs, which are numbered from 1 to 80. If one disc is drawn at random from the box, find the probability that it bears a perfect
Correct Answer - ` (i) 1/10 (ii) (a) 9/10 (b) 1/5`
2 Answers 1 views
In a survey of 200 ladies , it was found that 142 like coffee , while 58 dislike it . Find the probility that a lady chosen at random (i) likes coffee
Correct Answer - (i) 0.71 (ii) 0.29
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It is known that a box of 800 electric bulbs contains 36 defective bulbs . One bulb is taken at random of the box. What is the probability that the bu
Correct Answer - `(191)/(200) `
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Two cards are drawn at random from a pack of 52 cards one-by-one without replacement. What is the probability of getting first card
The required probability = P((The first is a red jack card and The second is a jack card) or (The first is a red non-jack card and The second is...
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