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X + Y < 1?

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X + Y < 1?

by sanju09 » Thu Apr 09, 2009 4:00 am
Is X + Y < 1?

(1) X < 8/9.

(2) Y < 1/8.



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by bluementor » Thu Apr 09, 2009 4:15 am
Is X + Y < 1?

Statement 1: X < 8/9. No info on y, insufficient.

Statement 2: Y < 1/8. No info on x, insufficient.

Both statements together: Add both statements

X + Y < 8/9 + 1/8
X + Y < (64 + 9)/72
X + Y < 1 + 1/72 …this does not guarantee X + Y < 1, so insufficient.

Choose E.

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Last edited by bluementor on Thu Apr 09, 2009 4:45 am, edited 1 time in total.
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by iamcste » Thu Apr 09, 2009 4:40 am
bluementor wrote: X + Y < 1 + 1/9 …this does not guarantee X + Y < 1, so insufficient.



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I think, this comes to 1+(1/72)
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by bluementor » Thu Apr 09, 2009 4:44 am
iamcste wrote:
bluementor wrote: X + Y < 1 + 1/9 …this does not guarantee X + Y < 1, so insufficient.



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I think, this comes to 1+(1/72)
You are absolutely right iamcste. Thanks!

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