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krunkchris
- Junior | Next Rank: 30 Posts
- Posts: 10
- Joined: Tue Feb 03, 2009 2:22 pm
ok so im have a problem distigushing when these specific formulas should be used. If someone could help me with example problems or just explain them to me a little better it would be greatly appreciated. Thanks?
1) n!/k!(n-k)! and is this the same as n/n-k?
2)The # of ways independent events can occur together can be determined by multiplying together the number of possible outcomes for each event?
3)if a first object may be chosen in m ways and a second object may be chosen in n ways, then there are mn ways of choosing both objects.
4)P(A or B)= P(A) + P(B) - P(A-B)
5)Indistinguishable events
6)combinations: order does not matter n!/r!(n-r)!
7)Permutations: order matters n!/(n-r)!
8) intersecting sets: A union B = A + B - A intersect B <in absolute values
Thanks guys, greatly appreciated.
1) n!/k!(n-k)! and is this the same as n/n-k?
2)The # of ways independent events can occur together can be determined by multiplying together the number of possible outcomes for each event?
3)if a first object may be chosen in m ways and a second object may be chosen in n ways, then there are mn ways of choosing both objects.
4)P(A or B)= P(A) + P(B) - P(A-B)
5)Indistinguishable events
6)combinations: order does not matter n!/r!(n-r)!
7)Permutations: order matters n!/(n-r)!
8) intersecting sets: A union B = A + B - A intersect B <in absolute values
Thanks guys, greatly appreciated.
