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unit digit question

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Source: — Data Sufficiency |
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by 4meonly » Fri Dec 05, 2008 8:21 am
I got D

(1)
2m = _ _ 2
m = _1
units digit = 1

(2)
2m = _ x _
m = _ x
this can be only if m = 99, and 2m = 198
units digit = 9


OA, please
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by cramya » Fri Dec 05, 2008 10:09 am
I am getting C)

m is two digit number and 2m is a three digit number

50<=m<99

Stmt I

the unit number of 2m is 4

104 - then m is 52
114 - then m is 57

INSUFF

Stmt II

the unit number of m is the same as the tens number of 2m

m is 50 2m 100
m is 74 2m is 148

2 different answers

INSUFF

Combined

numbers possible

m = 62 2m=124
m = 87 2m = 174

2 different units digits i.e 2 and 7

INSUFF


E)
Last edited by cramya on Fri Dec 05, 2008 10:31 am, edited 2 times in total.
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by 4meonly » Fri Dec 05, 2008 10:22 am
cramya, take the GMAt instead of me please :lol:
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by dmateer25 » Fri Dec 05, 2008 10:29 am
What about m as 87?

m=87
2m=174

I think E is correct
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by cramya » Fri Dec 05, 2008 10:30 am
Glad I have not! :-)

I made a msitake which I edited. It should be E)

2 numbers possible

m = 62 2m=124
m = 87 2m = 174

2 different units digits i.e 2 and 7

INSUFF

E)
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answer

by mmgmat2008 » Fri Dec 05, 2008 4:32 pm
Answer is E.

(1), the unit number of m could be 2 or 7
(2) m could be 64 or 87.
together, still not sufficient.
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by 4meonly » Fri Dec 05, 2008 9:56 pm
Hope I will not get any question involving picking numbers in real GMAT.
I really hate to pick numbers
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by cramya » Fri Dec 05, 2008 10:55 pm
Hope I will not get any question involving picking numbers in real GMAT.
I really hate to pick numbers
My request is dont avoid this please on the real GMAT.

Sometimes its time consuming but very effective and reliable(all of us need to get better and faster at it for sure :-) )

Also for some problems like this and others(some remainder problems) it comes in handy!
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