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n(S) = 100
peternak Sapi = A --> n(A)= 70
peternak Kambing = B--> n(B)= 60
Peternak Ayam = C--> n(C)= 35
n(AnB)= 40
n(AnC) = 25
n(AnBnC) = 5
dan 10 orang hanya peternak kambing = n(B) - n(AUC)= 10
1) peternak kambing dan ayam = n(BnC) -n (AnBnC) = 10
2) hanya peternak ayam = n(C) - n(AUB) = 0
3) bukan ketiganya = n(AUBUC)' = 10
4) ptrnak sapi/ayam tp bukan kambing?= n(AUC) - n(B) = 30
1. 10
2. 0
3. 10
4. 20
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