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The common ratio of the progression 81, 27, 9, 3 is:
AOne fifth
BOne sixth
COne third
DOne fourth
Answer & Solution
Correct answer: C. One third
1. Divide 27 by 81.
2. The terms are shrinking each time.
3. The common ratio is one third.
_Source: NCERT Class 11 Mathematics, Ch 8 'Sequences and Series'_
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