Geometric sequences and series

Geometric sequences and series Quiz

Spec 4.4 · Edexcel International A Level Maths: Quiz

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5 questions, one answer each

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1. Find the 6th term of $2,6,18,\dots$
- A. $486$
- B. $162$
- C. $1458$
- D. $54$
2. Find $S_\infty$ for $a=9$ , $r=\frac13$ .
- A. $27$
- B. $\frac{27}{2}$
- C. $3$
- D. $12$
3. Which series has a sum to infinity?
- A. $3+6+12+\dots$
- B. $5+5+5+\dots$
- C. $8+4+2+\dots$
- D. $1-2+4-\dots$
4. $a=3$ , $r=2$ . Find $S_6$ .
- A. $93$
- B. $192$
- C. $381$
- D. $189$
5. $3(0.8)^{n-1}<0.01$ . Smallest $n$ ?
- A. $26$
- B. $30$
- C. $27$
- D. $25$