alleryIs 1, -1, 1, -1 a geometric progression?
AYes, ratio +1
BNo, it is an AP
CYes, ratio -1
DNo, it repeats
Answer & Solution
Correct answer: C. Yes, ratio -1
1. Divide each term by the one before it.
2. Minus one divided by one is minus one, every time.
3. So it is a GP with common ratio minus 1.
4. The answer is yes, ratio -1.
_Source: syllabus Mathematics, Ch 8 'Predicting What Comes Next: Exploring Sequences and Progressions'_
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