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Combinatorics

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Re: Combinatorics

by x2suresh » Thu Feb 19, 2009 12:53 pm
4meonly wrote:OA D
I got 30 but thtre is no such answer :)
Image
different combinations possibel
187 --> 3! =6 ways
286 --> 3! =6 ways
277 --> 3!/2 =3 ways
367 --> 3! =6 ways
358 --> 3! =6 ways
466 --> 3!/2 =3 ways
457 --> 3! =6 ways
448 --> 3!/2 =3 ways
556 --> 3!/2 =3 ways

I get 42
C

What is the source of this question.
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by 4meonly » Thu Feb 19, 2009 1:28 pm
F****! stupid mistake - I counted when number are not repeated!!!! :shock:
I guess 42 will be correct
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