MISTAKE OR COERCION (Sec. 72)
A person to whom money has been paid, or anything delivered, by mistake or under coercion, must repay or return it to the person who paid it by mistake or under coercion. The word ‘coercion’ is used in Sec. 72 in its general sense and not as defined in Sec. 15.
Example: A and B jointly owe Rs. 100 to C. A alone pays the amount to C and B, not knowing this fact, pays Rs. 100 over again to C. C is bound to pay the amount to B.