Exams › SSC CGL (Prelims) › General

The 4th term of a GP is 81 and the first term is 3. Find the common ratio.

1. 2
2. 3
3. 4
4. 5

Correct answer: 3

Solution

For a GP, the 4th term is $ar^3$. Given $a=3$ and $a_4=81$, we get $3r^3=81$. Solving gives $r^3=27$, so $r=3$.

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