Which of the following set is closed under addition, subtraction and multipication?
A = {x │x = 2ⁿ , n ϵ N}
B ={x │x = 3n , n ϵ N}
C ={x │x = 3n , n ϵ Z}
All of these
Option: C
Explanation :
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If X, Y, Z are sets such that X ⊂ Y and Y ⊂ Z, then
X ∪ Y = Z
X ∩ Y = Z
X ∩ Y ∩ Z = Z
None of these
Option: D
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