## anonymous 4 years ago find the first term of the arithmetic sequence having the data given. an = 48, Sn = 546, n = 26

1. saifoo.khan

Do you know the formula?

2. anonymous

ish... not that well. Im just starting this and I just need some examples done.

3. anonymous

$\S_{n}=\frac{n}{2}(a_{1}+a_{n})$

4. anonymous

Sum.. $\LARGE Sn=\frac n2 [2a_1+(n-1)\cdot d]$ $\LARGE a_n=a_1+(n-1)\cdot d$