1.

If `A = {x : x in W, x le 8}` and `B = {x : x in W, x lt 19}`, the `n(A - B) = "____"`.

Answer» Correct Answer - B
`A = {0,1,2,3,4,5,6,7,8}` and `B = {1,2,3,4,5,6,7,8,9,10."……"18}`


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