GMAT Prep - 4-letter or 5-letter code

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GMAT Prep - 4-letter or 5-letter code

by jdawg » Mon Dec 08, 2008 8:17 am
Could someone pls. explain how to get C? Thanks!
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by EricLien9122 » Mon Dec 08, 2008 10:28 am
Total possible way: 26^4+26^5, which can rewrite as...26^4(1+26)=26^4(27).