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Question

Evaluate: $[(5^{- 1} \times 3^{- 1})^{- 1} \div 6^{- 1}]$

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Solution

$[(5^{- 1} \times 3^{- 1})^{- 1} \div 6^{- 1}]$
$= [(5^{- 1 \times - 1}) \times (3^{- 1 \times - 1})] \div 6^{- 1}$
$= [5 \times 3] \div 6^{- 1}$
$= [15 \times 6] = 90$

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