Question 57

x, y and z are distinct positive integers in which x and y are odd and z is even. Which of the following can not be true ?

Solution

Let $$x=5,z=4,y=3$$

(A) : $$(x-z)^2y =1\times3=3$$ is odd

(B) : $$(x-z)^2y^2=1\times9=9$$ is odd

(C) : $$(x-z)y=1\times3=3$$ is odd

(D) : $$(x-y)^2z=4\times4=16$$ is even

=> Ans - (A)

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