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Karo-lina-s
[1.5K]
2 years ago
7
What is the sum of the first 26 terms of the arithmetic series?
Mathematics
Answer
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2
answers:
ch4aika
[34]
2 years ago
7
0
The first term is 7, and the common difference is 4. We know this because 11-7=15-11=4. So the nth term is going to be 7+4(n-1). The 26th term will be 7+4(26-1)=7+100=107. The sum of the series is going to be (107+7)*13=1482.
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mestny
[16]
2 years ago
4
0
A(1) =
7
d=11-7=
4
a(26)= a(1)+d(n-1)= 7+4(26-1)=7+100=
107
S(n)= (n/2)*(a(1) +a(n))
S(26)=(26/2)*(7+107)=13*114=1482
S(26)=1482
Answer: 1482
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