# Functions 11: Series and Sequences

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4m + 1, m + 1 and 10 - m are the first three terms of a geometric sequence. Find t4.

• Functions 11: Series and Sequences -

since the difference is constant,

(m+1)-(4m+1) = (10-m)-(m+1)
m = -9

so the sequence is

-35, -8, 19, 46, ...

• Functions 11: Series and Sequences -

But they are not geometric sequence..

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