5) Prove that if x & y are both odd positive
integer the x^2 + y^2 is even but not divided
by 4.
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) (1) Write with reason, which of the following are finite or infinite: A = {xlx is a multiple of 3) (ii) B=(yly is a factor of 13) (iii) C = {..., -3, -2, -1,0) (iv) D-xlx=2", n EN)
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