Question

18cr= 18cr+2 find value of r

Answer 1

on solving
=18! /r! (18-r)! =18! / (r+2)! (16-r)!
= (r+2)!/r! =(18-r)! /(16-r)!
=(r+2)(r+1)(r)! /r! =(18-r)(17-r)(16-r)! /(16-r)!
=(r+2)(r+1)=(18-r)(17-r)
=r^2+3r+2=306+r^2-18r-17r
=304-38r
304=38r
r=304/38
=152/19
=8.45 (approximately )

Answer 2

Answer:

18cr=18cr+2then find the valueof rc5