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kelipatan 4 kurang dari 30
Q = { 4, 8, 12, 16, 20, 24, 28}
n(Q) = 7
no 4b)
3 < x < 17 , x E bil prima
R = { 5, 7, 11, 13 }
n(R) = 4
no 4c)
faktor dari 30
S = { 1, 2, 3, 5, 6, 10, 15, 30}
n(S) = 8