Question
Write the element $\text{a}_{23} \text{ of a 3} \times \text{3 matrix A} = \text({a}_{\text{ij})}$ whose elements $\text{a}_{\text{ij}}$ are given by $\text{a}_{\text{ij}} = \frac{|\text{i - j|}}{2}.$
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Answer
$\text{a}_{23} = \frac{|2 - 3|}{2} = \frac{1}{2}$
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