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23 Oct 2009, 09:08
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Hi,
In the exam I chose 72 (18*4), but now Im thinking about 108 (6*18)
but either answer is correct
In the exam I chose 72 (18*4), but now Im thinking about 108 (6*18)
but either answer is correct
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23 Oct 2009, 09:29
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This is combination problem:
In how many ways we can choose 4 people out of 18 applicants? 18C4=18!/14!*4!=3060
Answer: E.
In how many ways we can choose 4 people out of 18 applicants? 18C4=18!/14!*4!=3060
Answer: E.
23 Oct 2009, 10:18
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Bunuel
how can I calculate that in the exam?
18! means
18*17*16*15*14....2*1/ (14!-which is)14*13*12*12.....2*1*(4!-which is) 4*3*2*1
