The sum of the first n terms of a linear sequence is .

  1. ((a))

    Show that the sum of the first n terms in the sequence is always even.

  2. ((b))

    By finding the first three terms in the sequence or otherwise, find, in terms of n, an expression for the nth term of the sequence.

    Answer …..…

Arithmetic sequences and Gauss summationNth term中文
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