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by Mani_mba » Wed Oct 22, 2008 12:54 am
Number of 4-letter codes that can be generated using 26 letters of the alphabet = 26^4

No. of 5 letter codes that can be generated using 26 letters of the alphabet = 26^5

Hence total codes = 26^4 + 26^5 = 26^4(1+26) = 27(26^4)

So C is the answer.
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