The correct conversion of the recursive form into the explicit form is:
a^n = 7 * 3^(n-1)
Convert the recursive form a^1=7, a^n=3a^n-1 to the explicit form.
a^n=3(7)^n-1
a^n=7(3)^n+1
a^n=7(3)^n-1
a^n=3(7)^n
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