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B = {1,2,3,4,5,6,7,8,9}
2. n(A) + n(B)
4 + 9
= 13
B = {1,2,3,4,5,6,7,8,9}
n(A) = 4
n(B) = 9
n(A)+n(B) = 4+9 = 13
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