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number of element of the set

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Source: — Data Sufficiency |
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by brick2009 » Sat Nov 21, 2009 8:31 pm
Ans is : E

a.) n is even
22,23 => n = 2
5,6,7,8,9,10 => n=6
-----------> Insuff.

b.) n<9
1,2,3,4,5,6,7,8,9 = 45 , but n = 9

only other would be : n= 2 (22,23)
n = 6 (5 to 10)

--------> insuff

Thus, E
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by adam15 » Sat Nov 21, 2009 8:59 pm
well done.
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by mehravikas » Thu Dec 03, 2009 6:52 pm
Did you try adding a few numbers randomly? Is there a formula that you used or a method?
brick2009 wrote:Ans is : E

a.) n is even
22,23 => n = 2
5,6,7,8,9,10 => n=6
-----------> Insuff.

b.) n<9
1,2,3,4,5,6,7,8,9 = 45 , but n = 9

only other would be : n= 2 (22,23)
n = 6 (5 to 10)

--------> insuff

Thus, E
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