Counting problem

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mjjking: Master | Next Rank: 500 Posts; Posts: 353; Joined: Sat Jan 20, 2007 1:29 am; Location: Italy; Thanked: 7 times; GMAT Score:720

Counting problem

by mjjking » Sun Mar 08, 2009 2:54 am

Thanks guys!

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Last edited by mjjking on Sun Mar 08, 2009 1:10 pm, edited 1 time in total.

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Source: Beat The GMAT — Problem Solving | Sun Mar 08, 2009 2:54 am

Vemuri: Legendary Member; Posts: 682; Joined: Fri Jan 16, 2009 2:40 am; Thanked: 32 times; Followed by:1 members

Based on the answer choices, I narrowed down to 27(26^4)....26^5+26^4. But, I don't think my concept matches the answer choices. I was using combinations to solve this problem. 26c4+26c5. But this obviously does not seem to be correct. Anyone, please explain how this problem should be solved with the concept.