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A true-false test consisting of 20 questions can be marked in 1048576 different ways In how many ways can each question be marked true or false so that a 7 are right and 13 are wrong b at least

A true-false test consisting of 20 questions can be marked in 1,048,576 different ways. In how many ways can each question be marked true or false so that
a) 7 are right and 13 are wrong
b) at least 17 are right?

May 27 2020 View more View Less

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