1. a box contains 8 pairs of shoes. if 4 shoes are selected at random then find the probabilty that exactly one pair of shoes is selected??
2.neha's tv has only 4 channels; all of them quite boring,hence it is not suprising that she desires to change the channel after every one minute. find the probabilty that she is back to her original channel for the frist time after 4 minutes.
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