Quick questions on Sequences and series: arithmetic, geometric and binomial expansion - AQA A-Level Maths

1short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is off-by-one errors in the

n

-th term?

Show answer

The arithmetic term is

a + (n - 1)d

, using

n - 1

, not

n

, and the geometric term uses

r^{n-1}

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