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Manager
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Here is one from GmatPrep [#permalink] New post 19 Aug 2006, 06:48
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
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 [#permalink] New post 19 Aug 2006, 08:01
I wrote this on my paper to help me visualize:

0._ _ _

1) the tenths digit of 100z is 2.

So if you multiply the 0._ _ _ by 100 you are moving the decimal place over by 2 so you get _ _._ . This tells you that the units digit in 0._ _ _ is 2. But not enought by itself.

2) The units digit of 1,000z is 2

Multiply 0._ _ _ by 1,000 and you get _ _ _.0 This tells us that the units digit is 2, which means that the hundredths digit in 0._ _ _ is 2. This is enough.

Let me know if I missed something.
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 [#permalink] New post 19 Aug 2006, 08:28
Answer is E

Let z = 0.abcde

Question is what is b ?

ST1 100z = ab.cde and it is given that tenths digit is 2 i.e. c=2
NOT SUFF

ST2 1000z = abc.de and it is given that units digit is 2 i.e. c=2
NOT SUFF
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 [#permalink] New post 19 Aug 2006, 08:33
Ooops, carless mistake. Thanks for the catch.
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 [#permalink] New post 19 Aug 2006, 09:54
Thanks for the great explaination gmatornot!

The OA is E.
  [#permalink] 19 Aug 2006, 09:54
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