Question

if p,q and r in Ap,then prove that (p+2q-r)(2q+r-p)(r+p-q)=4pqr

Answer 1

2q = p +r

(p + 2q -r)( 2 q + r -p)( r +p -q)

( p + p + r -r)( p + r + r - p)( 2q - q)

2p ( 2r)( q

4pqr