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OpenStudy (anonymous):
What is the formula for the nth term of a geometric sequence with a4 = 16 and r = `1/2`? `a_(n)=16(1/2)^(n-1)`` ` `a_(n)=1/2(16)^(n-1)` `a_(n)=128(1/2)^(n-1)` `a_(n)=128(2)^(n-1)`
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