Question

Anybody know the answer to this?

Answer 1

Answer: Choice B

{4,5,6,7}

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Explanation:

Set A = {4,5,6,7,8,9} since these values are larger than 3 and smaller than 10. We only consider whole numbers in this range.

Set B = {1,2,3,4,5,6,7} represents positive whole numbers less than 8

To find the set $A \cap B$ we need to see which values are in both A and B at the same time. Those values are {4,5,6,7}

So $A \cap B = \{4,5,6,7\}$

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side note: the notation $A \cap B$ means "A intersect B", so we're looking at where the two sets intersect or overlap (ie what they have in common).