Question

in
Q9) a) if n[A)= 25, n(b)= 12and n(ANB)=5
find n(AUB)
b) write in set-builder form:
1){5,10,15,20,25}
2){1/1,1/2,1/3,1/4,..........}

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Answer 1

Answer:

didn't understand ur question sry