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Praetorian
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Manhattan Gmat Problem -Sequences 30 Nov 2003, 21:20
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hey all

Has anyone solve this week's manhattan gmat problem on sequences

https://www.manhattangmat.com

I get B...statement 2 is sufficient.

Any one get the same answer..

thanks
praetorian

PS : Stolyar, is it ok to post questions from manhattan's website?



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Manhattan Gmat Problem -Sequences 30 Nov 2003, 22:16
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didn't do much work on it..just plugged in the values..
got B.
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Manhattan Gmat Problem -Sequences 30 Nov 2003, 22:52
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dj
didn't do much work on it..just plugged in the values..
got B.


could you explain how you did it... i took forever to conclude that its B ..

thanks
praetorian
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Manhattan Gmat Problem -Sequences 30 Nov 2003, 23:15
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the pattern will be:
n=0, tn = 3
n=1, tn = 4
n=2, tn = 6
n=3, tn = 9
n=4, tn = 13
n=5, tn = 18
n=6, tn = 24
n=7, tn = 31
n=8, tn = 39
n=9, tn = 48
...

consider, n+1 divisible by 3 ...so, n = 2,5,8,11,14..... tn even/odd ..thus, A is not sufficient

consider, n-1 divisible by 4... n = 5,9,13,17,..... tn is even always even.
or, n = 1 + multiple of 4 (4,8,12....) ...is even always b/c multiple of 4 is always odd..
you might have noticed the pattern:
n=0 odd
n=1 even
n=2 even
n=3 odd
n=4 odd
n=5 even
n=6 even
n=7 odd
n=8 odd
........



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