Sir/madam as F=GMM/R2 and by Kepler's third law it is T2 proportion to R3 HENCE can I say F=GMMK/T4\3 where K is arbitrary constant after removing proportionality sign ?

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Sir/madam as F=GMM/R2 and by Kepler's third law it is T2 proportion to R3 HENCE can I say F=GMMK/T4\3 where K is arbitrary constant after removing proportionality sign ?

please show how you got the answer. I keep coming up with 2 different answers and would like to compare. Please hurry :) Thanks

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