<span>A. What comes next? 5, -15, 45, -135, …
answer is
3. 405, -1215, 3645
</span><span>B. What comes next? 1/3, 1, 5/3, 7/3, …
</span>answer is
<span>
3. 3, 11/3, 13/3
</span><span>C. What comes next? 4, -1, -6, -11, …
</span>answer is
<span>
1. -16, -21, -26
</span>
<span>
</span>