Write an equation for the nth term of the geometric sequence 3, 12, 48, 192,....?

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tn = 3 x 4^(n-1).
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Here, a = 3, and r = 4. So, tn = a x r^(n-1) = 3 x 4^(n-1).
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Tn = a x (4 power (n-1)).
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