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DS - please explain

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Source: — Data Sufficiency |
Master | Next Rank: 500 Posts
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by m&m » Wed May 13, 2009 10:21 am
let's rule out (B) since knowing what the variable b is doesn't help us solve for P without knowing the relationship of b to p.

in (A)
we have P=4A^2 - 4B^2 = 4(A^2 - B^2)

the question asks whether P = x*(x+1) = x^2 + x

now while A^2 = (B^2)^2 that would yield the form (B^2)^2 + B^2 the minus sign cannot co-exist with the consecutive integer criteria - so we can say B is sufficient to know that P cannot be product of consecutive integers

HOpe that helps
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by mike22629 » Wed May 13, 2009 10:44 am
I think you misread question MM. It asks if p is the product of two consecutive ODD integers.

We know that A,B,P are positive integers....

P = 4(A^2) - 4(B^2)

And even number times any odd number is always even; therefore both terms on the right side of the equation are even whether A or B are even or odd.

Furthermore, an even number minus an even number is always even.

The question asks if P is the product of two odd integers, which will always make it odd.

When can see that p will always be even thus making it impossible.

IMO A.
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