Question

how the force of gravitation between two masses will change if distance between them is reduced to half

Answer 1

if distance is reduced then force of gravitation between two masses will increase. ..

Answer 2

Hello my friend!
As we know that the force of gravitation is directly proportional to the product of the masses of the two objects and inversely proportional to the square of distance between them(two objects).
So,
If the distance between them is reduced to half then,the force of gravitation will increase between them.