Math CentralQuandaries & Queries


Question from Alice, a student:

Find the 24th term of this sequence
Find the sum of the first 21 terms

Hi Alice,

The sequence is arithmetic so you can use the following formulae:

an nth term in the sequence
am mth term in the sequence
d difference between consecutive terms
n, m term position in sequence (1st, 2nd, 3rd, etc.)
a1 first term in the sequence
Sn sum of the first n terms

Hope this helps,


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