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GMATPrep - math questions

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GMATPrep - math questions [#permalink] New post 19 Nov 2006, 06:30
Dear All
Attached some GMATprep questions that I got wrong and I don´t really know were my mistakes are. I would very much appreciate your help!
Thanks!!
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 [#permalink] New post 19 Nov 2006, 07:07
Hi tobiastt :)

The answer (B) is ok. The statment precises "for all integers n".

U are taking the case of 0x0 = 0 but 1x1 = 1 so it's not the multiplication (nxn = n^2) :). It remains only the substraction n - n = 0.
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 [#permalink] New post 19 Nov 2006, 07:15
# is either one of the four basic operations +.x,/ or -

what is 1 # 2

1) n#0 = n for all intigers n

2)n#n=0 for all intigers n

from one

n#0 = 0

n could be zero or any +ve intiger or -ve

if n is any +ve or -ve intiger thus # is either + -

if n = zero thus # is + - or x

either ways # cant be devision

we can never know 1#2 because # could be
+ or minus ........insuff

from two


EITHER n= zero and # is not devision and could be - or + or x

OR n is +ve or -ve intiger thus # is minus.............

1,2 are not zero

thus 1#2 is a subtraction operation

suff

i say b
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 [#permalink] New post 19 Nov 2006, 08:13
If (400)(6000) = (240)(100^x), what is the value of x?

First work out what 400 * 6000 is. This is easy 6 *4 = 24 plus add the missing zeros = 2,400,000.

We know that to get 240 to equal 2,400,000 then we need to multiply 240 by 10000 this is 100 * 100 = 10000. So 100^2

The answer is X = 2
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 [#permalink] New post 19 Nov 2006, 13:13
thanks for the replies. Yes, I always catch myself doing the same silly mistakes over and over. :oops: I have to find a way to overcome that.
  [#permalink] 19 Nov 2006, 13:13
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