10Pr, = 720 find r in given value
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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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