Math, asked by kirtankamboj, 8 months ago

10Pr, = 720 find r in given value​

Answers

Answered by anusikhabarman
0

Answer:

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=720

(10−r)!

10!

=720

720

10!

=(10−r)!

6!

10!

=(10−r)!

⇒7×8×9×10=(10−r)!

⇒7×(2×4)×(3×3×2×5)=(10−r)!

⇒2×3×4×5×6×7=(10−r)!

⇒7!=(10−r)!

⇒7=10−r

⇒r=10−7

r=3

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