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If S(n) = u(1) + u(2) + u(3)+…+u(n) = 4^...

If `S_(n) = u_(1) + u_(2) + u_(3)+…+u_(n) = 4^(n) -1`, find the first four terms of the sequence `{u_(n)}`.

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3, 12, 48 and 192
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