Question

if nc5=nc6 the value of 15cn​

Answer 1

Answer:Answer:

n=11 and 15cn= 1365

Step-by-step explanation:

nc5=nc6

n!/n-5! . 5! = n!/n-6! . 6! (cancel the n! on both sides )

we get

n-6! . 6!/n-5! . 5! = 1

n-6.  . 6 . 5!/ n-5 . n-6! . 5! = 1

now cut n-6! and 5! , we get

6/n-5=1

6= n-5

n=  6+5

n=11

15c11 = 15!/15-11! . 11!

Step-by-step explanation: