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a, b are positive numbers Which one is bigger? (a^-1+b^-1)

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Joined: 31 Dec 1969
Location: India
Concentration: General Management, Entrepreneurship
GMAT 1: 710 Q49 V0
GMAT 2: 740 Q40 V50
GMAT 3: 700 Q48 V38
GMAT 4: 710 Q45 V41
GPA: 4
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Kudos [?]: 101 [0], given: 88912

a, b are positive numbers Which one is bigger? (a^-1+b^-1) [#permalink] New post 08 Jul 2004, 15:24
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A
B
C
D
E

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a, b are positive numbers Which one is bigger? (a^-1+b^-1) ^-1 or (a^-1 * b^-1)
1) a=2b, 2) a+b>1
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Joined: 04 Jul 2004
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Kudos [?]: 26 [0], given: 0

 [#permalink] New post 09 Jul 2004, 05:29
(E)

Two numbers are:
ab/(a+b) and 1/ab

1: Insufficient
2: Insufficient

Combining:
we get b>1/3

Two numbers again after placing the value
2b/3 and 1/2b^2
which have the critical value 3/4

So Insufficient.

Correct me if I am wrong.
  [#permalink] 09 Jul 2004, 05:29
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a, b are positive numbers Which one is bigger? (a^-1+b^-1)

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