F.5 math's questions

1a)30P5 = 30 * 29 * 28 * 27 * 26 * 25 = 17100720 different lottery tickets.
b)17100720 * 30 = 513021600 different lottery tickets.

2a)All choices - including M1 and F2 choices
= (4+5)C4 - 2C2 * (4+5-2)C2
= 9C4 - 2C2 * 7C2
= 126 - 21
= 105 different choices.

2013-02-06 22:45:30 補充：
1a)

30P5 = 30 * 29 * 28 * 27 * 26 = 17100720.

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