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If a,b,c,d,e are positive numbers, then ...

If `a,b,c,d,e` are positive numbers, then which of the following holds good

A

`a/b+b/c+c/d+d/e+e/age5`

B

`3a+1/(a^(3))ge4`

C

`2a+3b+1/(a^(2))+1/(b^(3))ge7`

D

`(a+b)(1/a+1/b)ge4`

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