bigfernhead wrote:

Is x^2y^4 an integer divisible by 9 ?

(1) x is an integer divisible by 3

(2) xy is an integer divisible by 9

E

1. says nothing about y, Not suff

1.1 x=3, y=1, OK x^2y^4 is an INTEGER divisible by 9

1.2 x=3, but y= 1/2 so y=1/2^4 --> x^2y^4 can not be an integer divisible by 9

2. Again, xy is an integer and x^2y^2 can be an integer but y^2 alone can not necessarily be integer, so x^y^4 are not necessarily be an integer divisible by 9! not suff

1 and 2 combine, not suff too

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