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U2/U1 = 4

So Un = 3*4n-1

and therefore, U75 = 3*474 = 1.0704*1045 approx.

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You mean what IS a geometric sequence? It's when the ratio of the terms is constant, meaning: 1, 2, 4, 8, 16... The ratio of one term to the term directly following it is always 1:2, or .5. So like, instead of an arithmetic sequence, where you're adding a specific amount each time, in a geometric sequence, you're multiplying by that term.


Is this arithmetic or geometric 2 4 8 16?

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Related Questions

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