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Answer: a(n) = 11*2^(n-1)
a1 = 11
a2 = 22 = 11.2
a3 = 44 = 11.2²
a4 = 88 = 11.2³
......
=> this is a geometic with a1 = 11
r = 2
=> [tex]a(n)=11.2^{n-1}[/tex]
Step-by-step explanation: