Question

nCr+4×nCr-1+6×nCr-2+4×nCr-3+nCr-4=​

Answer 1

Answer:

If

n

C

r

+3

n

C

r+1

+3

n

C

r+2

+

n

C

r+3

n

C

r

+4

n

C

r+1

+6

n

C

r+2

+4

n

C

r+3

+

n

C

r+4

=

r+k

n+k

, then the value of k is

= 4