1. What is the sum of all even integers less than 41
A. 380 B. 390 C. 410 D. 420

2. Find the sum of the first 50 positive integers
A. 1255 B. 1275 C. 1285 D. 1295

3. Given the arithmetic sequence with a,=-4,d=4, find S¹⁰
A. 130 B. 140 C. 230 D. 240

4. In the arithmetic sequence -1,-7,13,-19, what is the sum of the first 10 terms?
A. -280 B. -300 C. -310 D. -550

5. Givenan arithmetic progression with a,=-8,An=20 and Sn=30 what is n?
A.3 B.4 C.5 D.6​