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Math Help - find combinations

  1. #1
    CyanSnow
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    find combinations

    Please solve the problem below:

    Q. From a group of 10students, 6 are to be chosen for a picnic party. There are 3students who decide that either all of them or none of them will join. In how many ways can the picnic party be chosen?
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  2. #2
    MHF Contributor

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    {7 \choose 3} + {7 \choose 6}
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