alleryA nonzero real GP has a₂=6,a₄=24. Which common ratios are possible?
Ar=2 or r=−2
BOnly r=2
Cr=4 or r=−4
DOnly r=−2
Answer & Solution
Correct answer: A. r=2 or r=−2
Dividing the fourth term by the second gives r²=4, allowing both signs of 2.
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