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Which of the following are sets ? Justify your answer.
A = {x: |x| < 15/4, x ∈ Z} is A is:
Ravi have 10 balls of different size but 5 are red coulered 3 are black and 2 are white. He put all balls in 3 different box, all red in box R, all white in box W and all black in box B such that R = {R₁, R₂, R₃, R₄, R₅}, B = {B₁, B₂, B₃}, W = {W₁, W₂}.
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