$$\left. \begin{array} { l } { ( 4.5 \times 10 ^ { - 3 } ) \times ( 6.7 \times 10 ^ { 5 } ) } \\ { - B } \end{array} \right.$$
$3015B$
$$3015=3^{2}\times 5\times 67$$
$$3015B$$
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$3015,\ -B$
