Question

The value of r if 18Cr is maximum is

pls explain fast

Answer 1

Step-by-step explanation:

18

C

r

=

18

C

r+2

So, r=r+2 or 18−r=r+2

× 16=2r

r=8

So,

8

C

5

=

5!3!

8!

=

6

6×7×8

=56.

Hence, the answer is 56.