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In a geometric sequence the nth term is computed by:
so in the given our nth term is 768, the 1st term is 6, the common ratio is 2 (we multiply 2 to get the next term).

768=6*2^{n-1} \\ 768/6=2^{n-1} \\ 128=2^{n-1} \\ 2^7=2^{n-1} \\ 7=n-1 \\ 8=n

Therefore 768 is the 8th term in the given sequence.

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