any two bodies attract each other with a force which is proportional to the difference of their masses

any two bodies attract each other with a force which is inversely proportional to the square of the distance between them

any two bodies attract each other with a force which is proportional to the product of their masses and inversely proportional to the square of the distance between them

any two bodies attract each other with a force which is proportional to the square of the distance between them

any two bodies attract each other with a force which is proportional to the sum of their masses