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2 answers:
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Answer: 258
Step-by-step explanation:
Since, the sum of GP is,
where r is the common ratio,
a is the first term,
n is the number of term,
Here, series is, 6, -12, 24, -48, _ _ _ _
Which is a GP ( Because there is common ratio in the given consecutive terms )
So, for the above series, a = 6, r = and n = 7,
⇒
⇒
⇒
⇒
Thus, the sum of the 7 terms of the given series is 258.