The intersection of sets a and b, a ∩ b, is {3, 5, 6}.
The intersection of two sets, denoted by the symbol ∩, represents the elements that are common to both sets. In this case, to find a ∩ b, we need to identify the elements that are present in both sets a and b.
From the given sets, set a is {2, 3, 4, 5, 6, 7} and set b is {3, 5, 6}. The elements that are present in both sets are 3, 5, and 6. Therefore, the intersection of sets a and b, a ∩ b, is {3, 5, 6}.
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