If x an y are integers greater than 1, is x a multiple of y?
2. x^2-x is a multiple of y
Please explain your answer
Good question :
(1) answers since x= y(3y+7) => x is multiple of y => SUFFI
(2) does not answer since x(x-1) is a multiple of Y but either (x-1) or x can be a muliple hence does not answer the question => INSUFFI
Its Now Or Never