Answer:
a6 = 18,000
Explanation:
a1 = 6
an = 5a(n-1)
a2 = 5a(2-1) = 5a1 = 5•6 = 30
a3 = 5a(3-1) =5a2 = 5•30 = 150
a4 = 5a(4-1) = 5a3 = 5•150 = 720
a5 = 5a(5-1) = 5a4 = 5•720 = 3600
a6 = 5a(6-1) = 5a5 = 5•3600 = 18000
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