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Three letters to each of which corresponds an envelope are placed in the envelopes at random. The probability that all letters are not placed in the right envelope will be

Three letters to each of which corresponds an envelope are placed in the envelopes at random. The probability that all letters are not placed in the right envelope will be Correct Answer <sup>5</sup>/<sub>6</sub>

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Rashed can stuff advertising circulars into envelopes at the rate of 45 envelopes per minute and Reena require a minute and a half to stuff the same number of envelopes. Working together, how long will it take Rashed and Reena to stuff 300 envelopes?
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Three letters are written to different persons and addresses on the envelopes are also written. Without looking at the addresses, the letter are put into the envelope, the probability that letters to into the right envelops is
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