Sigma notation and arithmetic series Quiz

1. An arithmetic sequence has $a=5$ and $d=3$. Find $u_{12}$.

• A. $36$
• B. $41$
• C. $38$
• D. $33$

2. Evaluate $\sum_{r=1}^{5}2r$.

• A. $30$
• B. $10$
• C. $15$
• D. $25$

3. Find the sum of the first $10$ terms of $2,5,8,\dots$

• A. $145$
• B. $310$
• C. $29$
• D. $155$

4. Find the sum of the integers from $1$ to $50$.

• A. $2550$
• B. $1275$
• C. $1225$
• D. $51$

5. An arithmetic series has $a=3$ and $d=2$. Its sum is $120$. Find $n$.

• A. $8$
• B. $12$
• C. $10$
• D. $11$