It says the letters can be repeated:Skywalker wrote:How to solve this one ....
OA == option E . Thanks
It also says same letters used in different order constitute to different code, So AB is different form BA
So 26+26^2+26^3=18278
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GMAT Prep : Combination ?
Source: Beat The GMAT — Problem Solving |
It also says same letters used in different order constitute to different code, So AB is different form BA
So 26+26^2+26^3=18278
1 letter code can be selected in 26 ways
2 letter code can be selected in 26 ^2 = 676 ways
3 letter code can be selected in 26 ^3 = 17,576 ways
Therefore, required number of codes = 26 + 676 + 17,576 = 18,278
[spoiler]The correct answer is (E).[/spoiler]
2 letter code can be selected in 26 ^2 = 676 ways
3 letter code can be selected in 26 ^3 = 17,576 ways
Therefore, required number of codes = 26 + 676 + 17,576 = 18,278
[spoiler]The correct answer is (E).[/spoiler]
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Quant Expert
Gurome, Inc.
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On MBA sabbatical (at ISB) for 2011-12 - will stay active as time permits
1-800-566-4043 (USA)
+91-99201 32411 (India)
Can you please explain the logic behind it,narik11 wrote:It says the letters can be repeated:Skywalker wrote:How to solve this one ....
OA == option E . Thanks
It also says same letters used in different order constitute to different code, So AB is different form BA
So 26+26^2+26^3=18278
why its not 26^3...
Saurabh Goyal
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EveryBody Wants to Win But Nobody wants to prepare for Win.
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EveryBody Wants to Win But Nobody wants to prepare for Win.
