13. What is the sum of the first 9 terms of 2, -6, 18, -54, ...?
a.) 10,122
b.) -12, 122
c.) 13,122
d.) -14,122
WITH SOLUTION SANA
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13. What is the sum of the first 9 terms of 2, -6, 18, -54, ...?
a.) 10,122
b.) -12, 122
c.) 13,122
d.) -14,122
WITH SOLUTION SANA
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Step-by-step explanation:
geometric sequence 9th term
a9=2(-3)^(9-1)
a9=13122
geometric series sum of the 9 terms
s9=[2((-3)^9-1)]/(9-1)
s9= -4921