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barn01
07.08.2021 •
Mathematics
Add the first 79 terms of this sequence:
-8,-1, 6, 13, 20, ...
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Ответ:
Sum is 20,935.
Step-by-step explanation:
This is an arithmetic progression.
Sum:
n is the number of terms, n = 79
S is the sum
a is the first term, a = -8
d is common difference, d = -1-(-8) = 7
substitute:
Ответ:
bn
Step-by-step explanation: