Quick questions on Arithmetic and geometric sequences (QCE Math Methods Unit 1)

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 on the exponent?

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The

n

th term uses

n - 1

(

T_n = ar^{n-1}

), while the sum uses

n

(

r^n

in the numerator). Mixing these is a frequent slip.

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