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If a, b, c, d are four positive number...

If `a, b, c, d ` are four positive numbers then (A) `(a/b+b/c) (c/d+d/c) <= 4.sqrt (a/c)` (B) `(a/b+b/c) (c/d+d/c) >= 4.sqrt (a/c)` (C)`a/b+b/c+c/d+d/e+e/a le 5` (D)`a/b+b/c+c/d+d/e+e/a ge 1/5`

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