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27 Nov 2004, 17:59
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How many different ways to pick 3 letters from ABCDEFG, when AB can't be together?
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27 Nov 2004, 21:57
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To choose 3 letters out of ABCDEFG without AB together :
we have to consider AB as ONE letter
so we have to choose 3 letters out of 6(since AB are one letter)
No. of ways to choosing are c(6,3) = 20.
What is the answer ?
we have to consider AB as ONE letter
so we have to choose 3 letters out of 6(since AB are one letter)
No. of ways to choosing are c(6,3) = 20.
What is the answer ?
There are 3 ways in which AB cant be together.
A Not B or B not A or Neither A Nor B
A Not B = 3(1. 5.4) = 60
B Not A = 3(1.5.4) = 60
Neither A Nor B = 5.4.3 = 60
180, if order matters.
If order doesnt matter: 5c2+5c2+5c3 = 30.
A Not B or B not A or Neither A Nor B
A Not B = 3(1. 5.4) = 60
B Not A = 3(1.5.4) = 60
Neither A Nor B = 5.4.3 = 60
180, if order matters.
If order doesnt matter: 5c2+5c2+5c3 = 30.
