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![[Post New]](/templates/default/images/icon_minipost_new.gif) 15 Jul 2008 23:20:54 IST
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A class prefect goes to meet the principal every week. his class has 30 people besides him. if he has to take groups of three every time he goes to the principal, in how many weeks will he be able to go to the principal without repeating the group of same three which accompanies him?
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15 Jul 2008 23:34:01 IST
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is the answer 2030?
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15 Jul 2008 23:37:50 IST
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not the answere is 4060....plzz tell how u did it
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15 Jul 2008 23:46:44 IST
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u merely have to select 3 guys out of 30 which is 30C3 .. 
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30C3 ways.......
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16 Jul 2008 09:43:01 IST
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the answere is correct but plzz tell the basic behind this
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16 Jul 2008 10:58:53 IST
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the answer is 24360 weeks
Explanation:
In the group there are 3 spaces
In the first space the options are of 30 students
In the second space the options are of 29 since 1 is taken first space
in third spce the options are of 28 since 2 are taken in the first and second space
Therefore = 30 * 29 * 28 = 24360
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16 Jul 2008 12:36:36 IST
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4060 weeks is almost 78 years. Well, they did say that one never stops learning ...
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16 Jul 2008 13:05:02 IST
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if the group of three includes the prefect then the answer is 30C2. if not then it is 30C3.
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