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Write the following intervals in set-builder form (ii) [6,12]

$\begin{array}{1 1}(A)\;\{x : x\in R,6 \leq x < 12\}\\(B)\;\{x : x\in R,8 \leq x < 12\}\\(C)\;\{x : x\in R,5 \leq x < 10\}\\(D)\;\text{None of these}\end{array}$

$\{x : x\in R,6 \leq x < 12\}$
Hence (A) is the correct answer.