Combination Math Problem. How many different cell phones can be selected from a shipment of twenty-four cells?
Wednesday, July 8th, 2009 at
2:41 pm
Combination Math Problem. How many different cell phones can be selected from a shipment of twenty-four cell phones? I know it can be written as 24C5. How many different combinations? Do you have to have a calculator to do this problem?
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Tagged with: calculator • cell phones • combinations • math problem
Filed under: Cell Phone Information
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Don’t use calculator it limits your brain and slows down your math learning easy way it to use the combination formula.
24*23*22*21*20/(5*4*3*2) = 42,504
5*4 gets rid of 20
3 reduces 21 to 7
2 reduces 24 to 12
then you have 12*23*22*7
easy way to do this is (10* 23 + 46) = 276
now 20*276 + 2*276 = 6072 and finally you can do 6072*7 = 42,504
hope it helps
24 C 5
can be written as
24 X 23 X 22 X 21 X 20
~~~~~~~~~~~~~~~~~
5 X 4 X 3 X 2 X 1
Hope u got the answer.