Math CentralQuandaries & Queries


Question from Ally:

-10 ... last term 35 common difference is 3
(a) find the number of term in the sequence.
i have lost the formula.


I don't remember formulas either but sine you mention the common difference is 3 I know this is an arithmetic sequence. The sequence starts at -10 and extends to 35. That's a distance of 45 units.


Suppose you are walking on the number line starting at -10, taking steps of length 3 units, and stopping at 35.

How many steps did you take?
How many terms are there in the sequence?

Be careful! The two questions above do not have the same answer,

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