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# PS: Star (any shortcut)

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Senior Manager
Joined: 19 Mar 2008
Posts: 344
PS: Star (any shortcut)  [#permalink]

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30 Aug 2008, 01:43
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Hi Anyone can think of a shortcut for item (iii)?

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Joined: 07 Nov 2007
Posts: 1728
Location: New York
Re: PS: Star (any shortcut)  [#permalink]

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30 Aug 2008, 05:46
judokan wrote:

Hi Anyone can think of a shortcut for item (iii)?

say a=1 b=2 and c=3

(a*b)=a+b-ab=3-2=1
(b*c)= -1

(a*b)*c= 1*3 = 4-1=3
a*(b*c)=1*-1 = 0+1=1
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Senior Manager
Joined: 19 Mar 2008
Posts: 344
Re: PS: Star (any shortcut)  [#permalink]

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30 Aug 2008, 19:34
Hi x2suresh ,

but the question asking "must be true". I am afriad picking number won;t work for all cases.

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Re: PS: Star (any shortcut) &nbs [#permalink] 30 Aug 2008, 19:34
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# PS: Star (any shortcut)

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