What is the **length** of the interval $[2, 11)$?
A$7$
B$8$
C$9$
D$13$
Answer & Solution
Correct answer: C. $9$
Length of any interval $(a, b), [a, b], [a, b)$, or $(a, b]$ is $b - a$, regardless of whether endpoints are included.
$11 - 2 = 9$.
Trap **D**: $11 + 2$ adds rather than subtracts.
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