Find r if 10Pr = 720. Share with your friends Share 3 Lovina Kansal answered this Dear student 10Pr=720⇒10!10-r!=10×72⇒10!10-r!=10×9×8⇒10!10-r!=10×9×8×7!7!⇒10!10-r!=10!7!⇒10-r!=7!⇒10-r=7⇒r=3 Regards 29 View Full Answer Indresh Kumar Yadav answered this Approx (10-r)! = 5040 5 Aiswarya T.a answered this r=3 15