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Ritesh
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Gmat prep" 3 letter code... 06 Dec 2006, 01:17
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Guys do help on this one how does one go bt solving this Q. Tired some combination nd permutation stuff but cudnt get the right answer...

Do explain...

Cheers!!



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Viperace
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Gmat prep" 3 letter code... 06 Dec 2006, 02:25
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Its E

26 alphabets to make up a code of one of the following form

1)O
2)OO
3)OOO

Possibility for 1) is 26 (A or B or C.... Z)
" for 2) is 26x26
" for 3) is 26x26x26

So, total possibility to make a code is
26 + 26x26 + 26x26x26
=18278
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sujayb
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Gmat prep" 3 letter code... 06 Dec 2006, 06:15
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It's strange that gmatprep would give a question where you would have to evaluate 26^3 :x
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MBAlad
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Gmat prep" 3 letter code... 06 Dec 2006, 12:58
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Ritesh - try searching for questions and you'll see that a lot of GMATPrep material has been posted before.

https://www.gmatclub.com/phpbb/viewtopic ... designates

https://www.gmatclub.com/phpbb/viewtopic ... designates

However, it's good to go over the tough ones!
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yogeshsheth
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Gmat prep" 3 letter code... 06 Dec 2006, 13:04
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26+26*26+26*26*26

Sums up to E
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Viperace
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Gmat prep" 3 letter code... 06 Dec 2006, 18:58
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sujayb
It's strange that gmatprep would give a question where you would have to evaluate 26^3 :x
Show more


It's fine.. just manually compute it :-D
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tennis1ball
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Gmat prep" 3 letter code... 06 Dec 2006, 19:33
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E.

26 + 26^2 + 26^3. remember letters can be repeated.
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jainan24
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Gmat prep" 3 letter code... 07 Dec 2006, 18:10
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if you don't want to cube 26 then use this

26(1 + 26 + 676) = 26 * 703

Then you can see that the answer has to be greater than (700 X 25) or 17500
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mst
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Gmat prep" 3 letter code... 07 Dec 2006, 19:02
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Actually if you want, you don't even need to calculate the square of 26.

you know the answer is: 26 + 26^2 + 26^3

You also know that the units digit of 26^2 is 6 .
And the units digit of 26^3 is also 6

So 26 + 26^2 + 26^3 = 26 + XY6+ABC6
= KLMN8

And there is only one answer choice which has 8 in the units digit - 18278



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This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
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