number properties

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sud21: Master | Next Rank: 500 Posts; Posts: 344; Joined: Sat Nov 12, 2011 3:21 amFollowed by: 2 members; Thanked: 1 times

by sud21 » Thu Jan 12, 2012 5:00 am

n=?
1). The tens digit of 11^n is 4
2). The hundreds digit of 5^n is 6

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Source: Beat The GMAT — Data Sufficiency | Thu Jan 12, 2012 5:00 am

neelgandham: Community Manager; Posts: 1060; Joined: Fri May 13, 2011 6:46 amFollowed by: 52 members; Location: Utrecht, The Netherlands; Thanked: 318 times

by neelgandham » Thu Jan 12, 2012 9:10 am

n=?

1). The tens digit of 11^n is 4

n can be 4 or 14 or.. Insufficient!

2). The hundreds digit of 5^n is 6

n can be 4 or 14 or.. Insufficient!

IMO E

Can you please provide the source of the question ?

Anil Gandham
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sam2304: Legendary Member; Posts: 1239; Joined: Tue Apr 26, 2011 6:25 amFollowed by: 26 members; Thanked: 233 times; GMAT Score:680

by sam2304 » Thu Jan 12, 2012 9:18 am

IMO E. Arrived at the same conclusion but used a calculator to check for 11^14. Too tough to be a GMAT question and if anybody has got a shortcut to solve this, it would be more helpful.

Getting defeated is just a temporary notion, giving it up is what makes it permanent.
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