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by resilient » Thu May 29, 2008 11:47 am
If x and y are positive integers and y=root (9-x), x=?
1). X<8

2.) y>1

qa is d
Last edited by resilient on Thu May 29, 2008 6:59 pm, edited 2 times in total.
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by chidcguy » Thu May 29, 2008 4:54 pm
Looks like you missed posting the second condition

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by amitansu » Fri May 30, 2008 12:01 am
Both are sufficient.

From q it self : y^2=9-x

From 1: x<8>1 again by plugin we can derive x=5 here.
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by shiraj » Fri May 30, 2008 6:45 am
Ans: D

Condition 1) By plugging x values (less than 8 and greater than 0)
we get only one value of y i.e, 2 for x=5

Condition 2) given y > 1 => 9-x > 1 => x < 8
And again by plugging in we get y=2 for x=5

Hence D
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