49. Let z be the set of all integers and A={(a,b): a + 3b= 28,a,b belong to z} B={(a,b): a>b,a,b belong to Z } Then n(AintersectionB) is equal to

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Z

A = {(a, b) : a^{2} + 3 b^{2} = 28, a, b \in Z}

B = {(a, b) : a < b, a, b \in Z}

A \cap B

Let f be the subset of Z × Z defined by f= {(ab, a+b) : a, b belongs to Z } . Is f a function from Z to Z ?

If A={5,6,9,11},B={9,10} let a R b means a<b.a belongs to A(a,b ) belongs to R, b belongs to B then the domain of the sets is {5,6,9,11}am I correct?

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Z^{+}

a * b = a - b, \forall a, b \in Z^{+}

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Z^{+}

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