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Mathematics 16 Online
OpenStudy (anonymous):

4 bananas are to be selected from a group of 7. in how many ways can this be done? so i write that like this? 4C7

jimthompson5910 (jim_thompson5910):

the other way around, 7 C 4

jimthompson5910 (jim_thompson5910):

use the same formula from before to evaluate

jimthompson5910 (jim_thompson5910):

in general, when you have n C r, the value of r will never be larger than n

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