Arithmetic sequences and series

Arithmetic sequences and series Quiz

Spec 4.2 · Edexcel International A Level Maths: Quiz

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5 questions, one answer each

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1. Find the 15th term of $3,8,13,\dots$
- A. $78$
- B. $73$
- C. $68$
- D. $75$
2. Find $1+2+3+\dots+60$ .
- A. $3660$
- B. $1860$
- C. $1830$
- D. $1800$
3. $a=2$ , $d=3$ . Find $S_{10}$ .
- A. $145$
- B. $310$
- C. $150$
- D. $155$
4. Evaluate $\displaystyle\sum_{r=1}^{5}(2r-1)$ .
- A. $20$
- B. $25$
- C. $30$
- D. $15$
5. The first term is $10$ and $S_4=28$ . Find $d$ .
- A. $-2$
- B. $-1$
- C. $1$
- D. $2$