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Thepotemich [5.8K]
3 years ago
11

What is the sum of the arithmetic series below?

Mathematics
1 answer:
Irina-Kira [14]3 years ago
5 0
Hello : 
the common ratio is r = -95-(-100)=5
the general terme is : un= u1+(n-1)r
un = -100 +(n-1)(5)
un =-100 +5n-5
un = 5n-105
The last term is : 100
un =100
5n-105 = 100
5n =205
n = 41 (Number of terms)
The last term is : u 41
<span>the sum is : S= (41/2)(-100+100)=0</span>
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