$$ \overline{8+7} $$ is used for grouping.
$$ 252 \div $$ [ 51 - {27 - ( 9 - $$ \overline{8+7} $$ ) }]
=$$ 252 \div $$ [ 51 - {27 - ( 9 - 15) }]
=$$ 252 \div $$ [ 51 - {33 }]
=$$ 252 \div $$ 18 =14
So , the answer would be option a)14.
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