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01 Jan 2007, 21:18
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Could some one explain this
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01 Jan 2007, 21:41
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A it is.
Stmt 1) 3y^2 + 7y =x
y( 3y +7 ) = x, if x and y are integers then clearly sufficient.
Stmt 2) (x^2 - x)/y is integer
x(x-1) /y = int so x or x-1 may be multiple of y or both
may be multiple of y not sure. So not sufficient.
Stmt 1) 3y^2 + 7y =x
y( 3y +7 ) = x, if x and y are integers then clearly sufficient.
Stmt 2) (x^2 - x)/y is integer
x(x-1) /y = int so x or x-1 may be multiple of y or both
may be multiple of y not sure. So not sufficient.
03 Jan 2007, 15:49
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(1) 3*y^2 + 7*y = multiple of y. Suff.
(2) x^2 - x. Let x=3: x^2 - x = 6 is multiple of y, but x=3 is not necessarily multiple of y. Let x=2: x^2 - x = 2 is multiple of y, then x=2 is also multiple of y. Insuff.
A.
(2) x^2 - x. Let x=3: x^2 - x = 6 is multiple of y, but x=3 is not necessarily multiple of y. Let x=2: x^2 - x = 2 is multiple of y, then x=2 is also multiple of y. Insuff.
A.
