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how to solve this?

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Junior | Next Rank: 30 Posts
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Joined: Fri Aug 31, 2007 8:14 am

by mtg123 » Wed Oct 03, 2007 1:45 pm
Num of 1 letter code = 26
Num of 2 letter code = 26 * 26 ( as letters can be repeated )
Num of 3 letter code = 26 * 26 * 26 ( as letters can be repeated )

So, total num of codes that can be formed = 26 + 26^2 + 26^ 3
= 18278 = Ans E

Please let me know the OA
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