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2 April, 13:56

How many ways are there to choose three donuts from 4 varieties if there must be an odd number of glazed donuts? the number of glazed must be 1 or 3?

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  1. 2 April, 14:16
    0
    1 glazed and 2 others or 3 glazed and 0 others

    1 x 3 x 3 + 1 x 1 x 1

    9 + 1

    10

    Answer: 10
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