Test Index

Sequence and Series

Question : 11 of 86

Marks: +1, -0

2,-6,18,-54

Solution:

Concept:

The common ratio of a geometric progression is the constant factor between consecutive terms.

Explanation:

Divide the second term by the first:

-6 \div 2 = -3

Divide the third term by the second:

18 \div (-6) = -3

Divide the fourth term by the third:

-54 \div 18 = -3

All divisions give the same result, so the common ratio is

-3

Answer:

-3

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