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M21-17

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Math Expert
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Joined: 02 Sep 2009
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M21-17  [#permalink]

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New post 16 Sep 2014, 01:10
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

94% (01:06) correct 6% (01:43) wrong based on 68 sessions

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Math Expert
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Re M21-17  [#permalink]

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New post 16 Sep 2014, 01:11
Senior Manager
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GMAT 1: 640 Q48 V29
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Re: M21-17  [#permalink]

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New post 28 Nov 2017, 08:26
+1 for D
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" The few , the fearless "
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Re: M21-17  [#permalink]

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New post 05 Feb 2019, 04:10
Can anyone please explain why we subtracted 9π- 4π if we wanted to find the total area of the ring? Shouldn't we be adding these two to find the total area which is the inner circle plus the outer circle?

Thanks in advance.
GMAT Club Bot
Re: M21-17   [#permalink] 05 Feb 2019, 04:10
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M21-17

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