If P and Q are invertible matrices of same order,then show that PQ is also invertible. Share with your friends Share 0 Lovina Kansal answered this Dear student Since both P and Q are invertible.∴P and Q are non-singular , i.e., P≠0 and Q≠0.Also, PQ=PQ≠0.So, PQ is non-singular.Therefore,PQ is invertible. Regards 5 View Full Answer