Hi i need Help with overlapping sets questions.
I can seem to figure out for 3 subgroups A B C when a problem says 30 belong to A and B if this means:
a) that 30 belong only to A and B
b) of those 30, 30 -x belong to only A and B and x to A, B and C.
Some else have the same doubt or its just me?
I can remenber know the exact problems but i am sure i have seen both interpretations.
From the statement " 30 belong to A and B" sounds to me as AnB, which in a 3 sub group sets includes a small portion AnBnC as well.