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141. Which of the following set is closed under addition, subtraction and multiplication?
A = {x │x = 2ⁿ | , n ϵ N}
B = {x │x = 3n | , n ϵ N}
C = {x │x = 3n | , n ϵ Z}
All of these
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142. 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
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