Answer:
Endpoint at one end and an arrow at the other end.
Step-by-step explanation:

In this case, the pattern is the number, in this case, 3, multiplied by the number below it.
See?

Hope this helped :)
If 154 people do both activities, then 196-154=42 people ski but don't snowboard.
If 42 people don't snowboard, then 200-42=158 people snowboard.