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Romashka [77]
2 years ago
13

Find the sum of the first 7 terms of the

Mathematics
1 answer:
mihalych1998 [28]2 years ago
3 0

Answer:

20078/243

Step-by-step explanation:

sn = a1-a1r^n/1-r

sn = a1 * 1-r^n/1-r

s7 = 6 * 1 - (-5/3)^7/1-(-5/3)

s7 = 6 * 10039/729

s7 = 6 * 10039/243*3

s7 = 2 * 10039/243

s7 = 20078/243

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