Question

please tell me friends
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Answer 1

$f = gm1m2 \div 3d ^{2}$

This may be the answer

I hope it may help you

Answer 2

if the distance of objects is increased 3 times then,

(Gm1m2)÷(3d)^2

(Gm1m2)÷9d^2

hence if distance is increased by 3 times then gravity is decreased by 9 times