Answer
$3^{6+6+6}$ = $3^{6*3}$ = $3^{18}$
Work Step by Step
$a^{x}$ *$a^{y}$ = $a^{x+y}$
This rule was used to get $3^6*3^6*3^6$ = $3^{6+6+6}$ = $3^{6*3}$ = $3^{18}$
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