Answer
See below.
Work Step by Step
According to the exercise:
$a_1=2,a_2=3$
$a_3=a_2\cdot a_1=3\cdot 2=6$
$a_4=a_3\cdot a_2=6\cdot 3=18$
$a_5=a_4\cdot a_3=18\cdot 6=108$
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