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If sum(k=1)^n ɸ(k)=2n/(n+1),then sum(k=1...

If `sum_(k=1)^n ɸ(k)=2_n/(n+1),then sum_(k=1)^10 1/(ɸ(k))`is equal to

A

`11/20`

B

220

C

`55/18`

D

110

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The correct Answer is:
B
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