Question

If 56pr+6:54pr+3=30,800:1. Find rp2

plz guys fastly,it's required ​

Answer 1

Step-by-step explanation:

∵ 56Pr + 6 : 54Pr + 3 = 30800 : 1

⇒ 56! / (50 - r)! = (30800 x 54!) / (51-r!)

⇒ 56 x 55 = 30800/(51 - r)

⇒ 51 - r = 10

∴ r = 41

rp2=41P2=41!/39!=41×40=1640 answer