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A:In Delta ABC, if r_1,r_2,r_3 are in H.P. then r_2//r=1//3 R: In DeltaABC,1/r_1+1/r_2+1/r_3=2/r

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A is true, R is true and R is CORRECT EXPLANATION of A
A is true, R is true and R is not correct explanation of A
A is true, R is false
A is false, R is true

Answer :D


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