1.

An urn contains 25 balls of which 10 balls bear a mark X and the remaining 15 bear a mark Y. A ball is drawn at random from the urn, its mark note down and it is replaced. If 6 balls are drawn in this way, find the probability that all will bear X mark not more than 2 will bear Y mark atleast one ball will bear Y mark The number of balls with X mark and Y mark will be equal.

Answer»

An urn contains 25 balls of which 10 balls bear a mark X and the remaining 15 bear a mark Y. A ball is drawn at random from the urn, its mark note down and it is replaced. If 6 balls are drawn in this way, find the probability that

all will bear X mark

not more than 2 will bear Y mark

atleast one ball will bear Y mark

The number of balls with X mark and Y mark will be equal.



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