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ktmsud

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- Why is 'G' [Universal gravitational constant] in Einsteins field equation?

I don't know complex mathematics about general theory of relativity but i tried to understand it from internet. Somewhere i heard that in GTR gravity is explained as curvature of space-time not as force as in Newton's laws. If GTR doesn't explains gravity as force then why G which is constant of force equation is in Einstein's field equation? How and Why this constant appear in Field equations or GTR?