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Permutation under Restriction

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Question

Solve it : $(7 + 5) \div 5 + 6$

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Solution

$(7 + 5) \div 5 + 6$
$= (12 \div 5) + 6$
$= \frac{12}{5} + 6$
Taking $L C M$
$= \frac{30 + 12}{5} = \frac{42}{5}$

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Permutation under Restriction

Standard XII Mathematics