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# This is from GMAT 800 z1, z2, z3, ... , zn is a series of

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This is from GMAT 800 z1, z2, z3, ... , zn is a series of [#permalink]

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25 Jul 2005, 19:43
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This is from GMAT 800

z1, z2, z3, ... , zn is a series of consequtive positive integers.

Is the sum of this series odd?

(1) (z1+z2+z3+ ... +zn)/n is an odd integer.

(2) n is an odd integer.
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26 Jul 2005, 19:26
A.
I hv seen this problem before.
S1: Average of even no of consecutive integers cannot be an integer.
Hence, n = odd
Average = odd
Sum = Av * n = Odd * Odd = Odd.

S2: No information other than N = odd
Insuff
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27 Jul 2005, 00:09
i tested with values, got (A) for all values i used... miserable 4 mins spent finding reasons why not to choose (C), an obvious choice.
27 Jul 2005, 00:09
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