Question

find r if 9cr-8c3=8c2​ maths

Answer 1

Answer:

R Is 3 or 5

Explanation:

8

C

r

−

7

C

3

=

7

C

2

or

8

C

r

=

7

C

3

+

7

C

2

=

8

C

3

=

8

C

5

∴ r = 3