What is a1 of the arithmetic sequence for which a3=126
and a64=3,725
a
64
=
3
,
725
?

In an arithmetic sequence, every pair of consecutive terms differs by a fixed number c, so that the n-th term is given recursively by

Then for n ≥ 2, we have

and so on, up to

Given that and , we can solve for :

step-by-step explanation:

4.

step-by-step explanation:

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