Question

10cr = 10cr+4 then find 5pr​

Answer 1

Answer:

The answer is 5.

Step-by-step explanation:

We know that

n

C

x

=

n

C

y

⇒x+y=n

10

C

r

=

10

C

r+2

⇒r+r+2=10

⇒2r=10−2=8

⇒r=

2

8

=4

∴

5

C

r

=

5

C

4

=

1!4!

5!

=

4!

5×4!

=5