Answer
$6 \times 10^9$
Work Step by Step
$a^m \cdot a^n = a^{m+n}$
Multiply the corresponding parts and use the rule above when necessary to obtain:
$=(2\cdot3) \times (10^6 \cdot 10^3)
\\=6 \times 10^{6+3}
\\=6 \times 10^9$
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