Jawabanmu

2014-02-06T17:47:58+07:00
N(A U B)=n(A)+n(B)-n(A∩B)
             =28+19-12
             =47-12=35
2 5 2
2014-02-06T17:52:24+07:00
28 - 12 = 16. 19 - 12 = 7. n (AnB) = 12. maka, 16 + 7 + 12 = 35. jadi, n (AUB) = 35.
kalau n(A)=21 n(B)=18 dan n(AUB)=32 maka n (A∩B)= ?
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