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Three letters are written to different p...

Three letters are written to different persons and their addresses are also written on three envelopes. Letters are put at random in the envelopes. Then the probability that at least two letters are put in correct envelopes, is _______.

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A DAS GUPTA-Elementary Probability-Exercise
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  3. Three letters are written to different persons and their addresses are...

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  4. Three letters are written to different persons and their addresses are...

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  5. There are 4 envelops and 4 letters are to be put in these envelopes ra...

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  11. Three dice are thrown simultaneously. The probability of obtaining a s...

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  14. The probabilities that on a certain day the two trains from Calcutta a...

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  15. If four whole numbers taken art random are multiplied together, the...

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  16. Three six-faced dice are thrown together. The probability that the sum...

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  17. Four small squares on a chessboard are selected at random. The probabi...

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  18. A coin is tossed three times. The probability of getting head and tail...

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  20. A bag contains 17 markers with numbers 1 to 17 . A marker is drawn at ...

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