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a,b and c are the three sums of money...

a,b and c are the three sums of money such that b is the simple interest on a and c is the simple interest on b for the same time and same rate. Which is the following is correct?     (a) abc=1 (b) `c^2`=ab (c) `b^2`=ac (d) `a^2`=bc

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