Given the sets A = {2, 3, 4, 5, 6, 7}, B = {6, 7, 8} and C = {1, 5, 8, 9} then find A ∩ (B U C) and number of elements in A ∩ (B U C)

1
{6, 7, 8}, 3
2
{5, 6, 7}, 3
3
{4, 5, 6,7}, 4
4
{4, 5, 6}, 3

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