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The probability that a person will make 0,1,2,or 3 errors on his income tax is .5, .3, .15 and .05 respectively. If 30 tax forms

The probability that a person will make 0,1,2,or 3 errors on his income tax is .5, .3, .15 and .05 respectively. If 30 tax forms are filed, what is the probability 15 will contain no errors, 8 will have one error , 5 will have two errors and 2 will have three errors.

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