Q. Find S₁₄ 
7, 2, -3, ...

Q. The sequence 28, 34, 40, 46, 52, ..., 88 has 11 terms. Evaluate the related series. 

Q. Find S_n for the given series:
a₁=22
d=-8
n=21

Q. Find the sum 
24+48+72+...+480

Q. Find the missing terms of the arithmetic sequence:
145, ___, ___, ___, 205

Q. Find how many terms are in the series below:
7+13+19+25...=1044