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(a) How many ways are there of selecting r = 6 items from n = 9 Without replacement ? 2MARKS (b) How many different binary

(a) How many ways are there of selecting r = 6 items from n = 9 Without replacement ? 2MARKS (b) How many different binary sequences (that is, sequences of zeros and ones) of length n = 8 are there that contain 7' = 4 ones ? 2MARI

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