values, you will see:
, 
Put 2 in 
Put 3 in 
![S_{n}=\frac{n}{2}[2a+(n-1)d]](/tpl/images/0029/0777/c9fce.png)
is the sum of nth terma is the first term (in our case it is 68.7)n is the term number (in our case we want to find 50th sum, so n = 50)d is the common difference (in our case it is -2.3)![S_{50}=\frac{50}{2}[2(68.7)+(50-1)(-2.3)]\\S_{50}=25[137.4+(49)(-2.3)]\\S_{50}=25[24.7]\\S_{50}=617.5](/tpl/images/0029/0777/c0ecc.png)
Calculate s50 for the arithmetic sequence defined by
...
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