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Find the sum of the first 14 terms for the sequence -2,10,-50,....
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Find the sum of the first 14 terms for the sequence -2,10,-50,....

User Namit Gupta
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3.4k points

1 Answer

2 votes

Answer:

Explanation:

a=-2

r=10/-2=-5


s_(14)=a(r^n-1)/(r-1) \\=-2((-5)^(14)-1)/(-5-1) \\ =(1)/(3)(5^(14)-1)\\=(6103515625-1)/(3)\\=(6103515624)/(3)\\=2034505208

User Harry Blue
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