Find 25 combination r if n permotation r = 32760 , n combination r = 1365
Answers
Answered by
5
Step-by-step explanation:
We know
15
P
1
=15,
15
P
2
=15×14=210,
15
P
3
=15×14×13=2730
and
15
P
4
=15×14×13×12=32760
Therefore, r=4
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