Mathematics, 03.10.2019 01:00 smokemicpot
The 16th term of an a. p. is 40 and the sum of the first 5 terms is 5. find the sum of the first 50 terms.
Answers: 1
, where,
![S_n=\frac{n}{2}[2a_1+(n-1)d]](/tpl/images/0284/7536/195cc.png)
![5=\frac{5}{2}[2a_1+(5-1)d]](/tpl/images/0284/7536/8c55a.png)
![5=2.5[2a_1+4d]](/tpl/images/0284/7536/7c4bd.png)
in equation (1):
![S_{50}=\frac{n}{2}[2a_1+(n-1)d]](/tpl/images/0284/7536/d13d4.png)
![S_{50}=\frac{50}{2}[2(-5)+(50-1)3]](/tpl/images/0284/7536/4fc05.png)
![S_{50}=25[-10+(49)3]](/tpl/images/0284/7536/e9948.png)
![S_{50}=25[-10+147]](/tpl/images/0284/7536/cdd8d.png)
![S_{50}=25[137]](/tpl/images/0284/7536/0bb12.png)
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The 16th term of an a. p. is 40 and the sum of the first 5 terms is 5. find the sum of the first 50...
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