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What is the sum of the seven terms of the geometric series 2- 8+32-...? S7=6554 S7=-8192 S7=8192 S7=10922
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What is the sum of the seven terms of the geometric series 2- 8+32-...?

S7=6554
S7=-8192
S7=8192
S7=10922

User Ssb
by
8.8k points

1 Answer

4 votes
The first term is 2 and the common ratio = -8/2 = -4

S7 = 2 * (-4)^7 - 1
------------- = 6554 answer
-4-1
User Mijanur Rahman
by
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