Mathematics, 09.06.2020 16:57 bankscorneliuso39
10+12+14+...+(2n)=90 n=?
Answers: 2
...(1)
is sum of A.P., whose first term is 10 and common difference is 2.
![S_n=\dfrac{n}{2}[2a+(n-1)d]](/tpl/images/0680/7961/4b33c.png)
![S_n=\dfrac{n}{2}[2(10)+(n-1)2]](/tpl/images/0680/7961/1744c.png)
![10+12+14+...+2n=n[10+n-1]](/tpl/images/0680/7961/a3e31.png)
![10+12+14+...+2n=n[9+n]](/tpl/images/0680/7961/398a6.png)
...(2)
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10+12+14+...+(2n)=90 n=?...
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