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排列 組合

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  • 解數雜貨店
    2020-09-19 09:44:32
    1a) Multiple of 4 = {4, 8, 12 ... 80} P(Divisible by 4) = 20/80 b) Multiple of 5 = {5, 10, 15 ... 80} P(Divisible by 4) = 16/80 c) Multiple of both 4 and 5 = {20, 40, 60, 80} P(Divisible by 4 or 5) = P(Divisible by 4) + P(Divisible by 5) - 4/80
  • 解數雜貨店
    2020-09-19 09:52:10
    2a) Don’t think you didn’t know b) P(First is 5 but second is not) = (1/6)(5/6) P(First is not 5 but second is) = (5/6)(1/6) Add the above together
  • 解數雜貨店
    2020-09-19 10:02:10
    3a) P(Only King Ho is lates) = 0.5(1-0.3) P(Only Lok Man is late) = 0.3(1-0.5) Add the above togather b) P(At least one is not late) = 1 - P(Both are late) = 1 - (0.5)(0.3)
  • 解數雜貨店
    2020-09-19 10:04:02
    4a) Don’t think you didn’t know b) P(B or above) = (x+33)/20
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