# Math Help - arithmetic sequence

1. ## arithmetic sequence

Find the nth term of the arithmetic sequence whose initial term is 1 and common difference is 2 Your answer must be a function of n .

seems easy i think it would be 1+2n but thats not right anyone know what im doing wrong

2. Originally Posted by dat1611
Find the nth term of the arithmetic sequence whose initial term is 1 and common difference is 2 Your answer must be a function of n .

seems easy i think it would be 1+2n but thats not right anyone know what im doing wrong
That would make the first term $a_1=3$, unless you want to start from $n=0$. Try:

$a_n=-1+2n$

or:

$a_n=1+2(n-1)$

CB