If x and y are positive odd integers and z is an even integer, which one of the following statements cannot be true?

A (x-z)y^2 is odd

B (x-z)^2y is even

C (x-z)y is odd

D (x-y)^2z is even

E none of these

Solution

Correct Answer: Option B

-(x-z): odd - even = odd
-y²: odd × odd = odd
-(x-z)²: odd × odd = odd
-(x-y): odd - odd = even

*এখন options গুলি যাচাই করি:
-(A) সত্য: odd × odd = odd
-(B) সত্য নয়: odd × odd = odd (even নয়)
-(C) সত্য: odd × odd = odd
-(D) সত্য: even × even = even
*সুতরাং, (B) (x-z)²y is even হল একমাত্র statement যা true হতে পারে না। এটি সবসময় odd হবে।
*তাই সঠিক উত্তর হল (B) (x-z)²y is even।

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