[tex]3p(p - q - r) + 20(q + r)[/tex]please help me I will mark you as brainlist. Created by vbehera438.

Answer:p−1,p+3,3p−1 are in A.P.∴2(p+3)=p−1+3p−1⇒2p+6=4p−2⇒2p=8∴p=4