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Per NCERT Example 8, is 1, −1, 1, −1, 1, ... a GP — and what is the common ratio?
ANo, sequences can't have negative ratios
BYes, with common ratio r = −1 (alternating signs)
CYes, with r = 1
DThis isn't a sequence at all
Answer & Solution
Correct answer: B. Yes, with common ratio r = −1 (alternating signs)
Per NCERT, −1/1 = 1/(−1) = −1. Common ratio r = −1, producing alternating signs.
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