Mathematics
If A = {x : x ∈ N, 5 ≤ x < 10} and B = {1, 2, 3, 4, 5}, then n(A - B) is equal to
- 1
- 2
- 4
- 5
Sets
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Answer
First, write the sets in roster form:
A = {5, 6, 7, 8, 9}
B = {1, 2, 3, 4, 5}
A - B = {5, 6, 7, 8, 9} - {1, 2, 3, 4, 5} = {6, 7, 8, 9} (Elements in A not in B).
The count n(A - B) = 4.
Hence, option 3 is the correct option.
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