Question

10cr+1=10cr-1 then r equal to​

Answer 1

Step-by-step explanation:

this question is wrong

Answer 2

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