Sheila, a fifth grader, and Jimmy, a sixth grader, collect all their toys and decide to play together. Sheila has 18 different toys and Jimmy has 19 different toys. If Sheila and Jimmy decide to play with at least one toy from Sheila and one toy from Jimmy at a time, with how many different collections of toys (up to 37 toys at a time) can the both of them play?

1. 342

2. 116,964

3. More than 137 billion

4. 37C2