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If a, b, c, d are four distinct numbers in A.P. , show that `1/a + 1/d gt 1/b + 1/c gt 4/(a + d)`

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PATHFINDER-PROGRESSION AND SERIES -QUESTION BANK
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  8. If m is the A.M. of two distinct real number l and n(l , n gt 1) and G...

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