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ritula
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GMATPREP:Permutaion & combination 29 Jan 2009, 04:18
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Pls explain ur answers



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GMATPREP:Permutaion & combination 29 Jan 2009, 05:30
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It will be 26 + (26*26) + (26*26*26)
= 18278
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GMATPREP:Permutaion & combination 29 Jan 2009, 08:30
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scthakur
It will be 26 + (26*26) + (26*26*26)
= 18278
Show more

Same approach.

just my 2 cents.. no need to calculate/multiple..
26 + (26*26) + (26*26*26) --> all these end with unit digit 6.
SUM OF THESE THREE NUMBERS must be NUMBR with unit digit 8
only one option available.
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ritula
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GMATPREP:Permutaion & combination 29 Jan 2009, 10:33
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+1 for this shortcut.
x2suresh
scthakur
It will be 26 + (26*26) + (26*26*26)
= 18278

Same approach.

just my 2 cents.. we no need to calculate/multiple..
26 + (26*26) + (26*26*26) --> all these end with unit digit 6.
so sum's last digit must be 8 only one option available.
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Economist
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GMATPREP:Permutaion & combination 01 Feb 2009, 07:00
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So..one thing to note here...may be people already know.

Permutation formula nPr = n! / (n-r)! doesnt consider repetitions :)



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