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How many friends must you have to guarantee that at least five of them will have birthdays in the same month?

  • statistics -

    p(at least 5 have the same month)
    p(someone shows w/ at least someone else)

    P(s)+ P(d) = 100 %
    100%- P(d)
    (12 *11*10*9*8)/12^5
    P(d) =95040/248832 = .3819
    100% -0.3819 = 0.6181

    61.81%

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