Question

Find 25 combination r if n permotation r = 32760 , n combination r = 1365​

Answer 1

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