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if 1/a,1/b,1/c,1/d are in AP prove that ab + bc +cd = 3ad if 1/a,1/b,1/c,1/d are in AP prove that ab + bc +cd = 3ad
Hey student,You can find a similar question herehttp://www.askiitians.com/forums/Algebra/if-a-b-c-d-are-in-hp-then-prove-that-ab-bc_95273.htm
Dividing by abcd, we have to prove that or that LHS can be factorised as Since the given numbers are in AP we have Hence we get
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