SOLUTION: How do i write an equation for the nth term of the arithmetic sequence. 3,6,9,12,...

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Question 1042999: How do i write an equation for the nth term of the arithmetic sequence.
3,6,9,12,...
Answer by ikleyn(52788) About Me  (Show Source):
You can put this solution on YOUR website!
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How do i write an equation for the nth term of the arithmetic sequence.
3,6,9,12,...
~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 

a%5Bn%5D = 3 + (n-1)*3,

or, since a%5B1%5D = d = 3 for this arithmetic progression, you can simplify the formula 

a%5Bn%5D = 3n.

On arithmetic progressions read the lessons
    - Arithmetic progressions
    - The proofs of the formulas for arithmetic progressions
    - Problems on arithmetic progressions
    - Word problems on arithmetic progressions
    - Chocolate bars and arithmetic progressions
    - Mathematical induction and arithmetic progressions
    - Solved problems on arithmetic progressions
in this site.