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A tray contains 11 chocolate chip cookies and 15 oatmeal raisin cookies. How many ways can a child select 4 cookies that include at least 1 chocolate chip cookie?

  • math -

    number without any restriction
    = C(26,4) = 14950

    number which are all oatmeal
    = C(15,4) = 1365

    so, the number with at least one chocolate chip
    = 14950-1365 = 13585

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