Bunuel wrote:
How many positive integers less than 200 are there such that they are multiples of 13 or multiples of 12 but not both?
A. 28
B. 29
C. 31
D. 32
E. 33
Hi
Is there a way we can apply Set theory here using the formula n(AUB)=n(A)+n(B)-n(AUB)+none?
IMHO, not using the Set theory will easily make you err in such questions.