1.

An urn contains 9 red, 7 white and 4 black balls. If two balls are drawn at random find the probability that (i) both the balls are red. (ii) one is white and other is red. (iii) the balls are of same Colour. Or A box contains 10 bulbs, of which just three are defective. If at random a sample of five bulbs is drawn, find the probabilities that the sample contains (i) exactly one defective bulb. (ii) exactly two defective bulbs. (iii) no defective bulbs.

Answer»

An urn contains 9 red, 7 white and 4 black balls. If two balls are drawn at random find the probability that

(i) both the balls are red.

(ii) one is white and other is red.

(iii) the balls are of same Colour.

Or

A box contains 10 bulbs, of which just three are defective. If at random a sample of five bulbs is drawn, find the probabilities that the sample contains

(i) exactly one defective bulb.

(ii) exactly two defective bulbs.

(iii) no defective bulbs.



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