Seven person \(P_1,P_2......, P_7\) initially seated at chairs \(C_1,C_2,.....C_7\) respectively.The

Seven person \(P_1,P_2......, P_7\) initially seated at chairs \(C_1,C_2,.....C_7\) respectively.The - চর্চা

Seven person $P_1,P_2......, P_7$ initially seated at chairs $C_1,C_2,.....C_7$ respectively.They all left there chairs simultaneously for hand wash. Now in how many ways they can again take seats such that no one sits on his own seat and $P_1$ , sits on $C_2$ and $P_2$ sits on $C_3$ ?