Question

If 8![13!+54!]=9Pr, then the value of r is equal to

Answer 1

Answer:

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Answer 2

Answer:

We have, 8![

3!

1

+

4!

5

]=

9

P

r

⇒8![

3!

1

+

4⋅(3!)

5

]=

9

P

r

⇒

3!

8!

(1+

4

5

)=

9

P

r

⇒

3!4

8!9

=

9

P

r

⇒

4!

9!

=

(9−r)!

9!

On comparing, we get

9−r=4

⇒r=5