Question:নিচের কোন সেটটি `NN = ZZ`  এর উপসেট? 

A {-3, -2, -1} 
B {0,1,2} 
C {-3, -2, 1} 
D {-1, 0,1} 

+ Answer
A 

+ Explanation
`NN = ZZ - NN = {....-4, -3, -2, -1, 0,1,2,3......}`

     -{1,2,3.....} = {......,-4, -3, -2,-1, 0}

     :. {-3, -2, -1}` sub NN`

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