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New Member
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Jan 22, 2009, 08:43 AM
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I think this is a riddle.
Five people want a photographer to take pictures of every possible group of three of them.
How many different photos will the photographer need to take?:confused:
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Uber Member
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Jan 22, 2009, 09:03 AM
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C(5,3)
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New Member
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Jan 22, 2009, 12:02 PM
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Math, riddle
Five people want a photographer to take pictures of every possible group of three of them. How many pictures will the photographer need to take?
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Ultra Member
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Jan 22, 2009, 12:06 PM
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This is not a riddle. It is just wanting to know how many ways you can choose 3 items from 5.
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Ultra Member
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Jan 22, 2009, 12:17 PM
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Do you know this notation? Factorials ans so forth. Do you have a calculator? Most of them will quickly do it.
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Uber Member
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Jan 22, 2009, 01:13 PM
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You can do it yourself by going through all the combinations logically too, the answer is not large!
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New Member
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Jan 22, 2009, 01:32 PM
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Originally Posted by galactus
This is not a riddle. It is just wanting to know how many ways you can choose 3 items from 5.
can you show me how to do this step by step?:confused:
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New Member
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Jan 22, 2009, 01:36 PM
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Originally Posted by Capuchin
you can do it yourself by going through all the combinations logically too, the answer is not large!
I still don't understand can you show me step by step please!:confused:
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Uber Member
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Jan 22, 2009, 02:54 PM
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5! = 5x4x3x2x1, so expanding galactus' answer:
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New Member
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Jan 22, 2009, 10:58 PM
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Originally Posted by Capuchin
5! = 5x4x3x2x1, so expanding galactus' answer:
is the answer a total of 10:confused:
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Uber Member
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Jan 23, 2009, 12:56 AM
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Yes
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New Member
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Jan 23, 2009, 08:51 AM
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Originally Posted by Capuchin
yes
thank tou:)
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Uber Member
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Jan 23, 2009, 09:45 AM
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You can also check by working out all the possible combinations yourself:
The first is obviously
123
Then you change the last digit until you run out
124
125
Now you change the 2nd digit and repeat
134
135
And again
145
Now you've run out of second digits so change the first:
234
235
Now change the second digit again:
245
Now the first again
345
Now we've found them all! Count them up and there's 10 :)
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New Member
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Jan 23, 2009, 12:03 PM
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Originally Posted by latasha johnson
thank tou:)
thank you, you have been of great help! :)
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