If Task 1 must precede Task 2 and Task 3, with no order between Task 2 and Task 3, how many valid total orders exist?

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Multiple Choice

If Task 1 must precede Task 2 and Task 3, with no order between Task 2 and Task 3, how many valid total orders exist?

Explanation:
If Task 1 must come before both Task 2 and Task 3, Task 1 has to be first. After placing Task 1 at the front, there’s no restriction between Task 2 and Task 3, so they can appear in either order: Task 2 followed by Task 3, or Task 3 followed by Task 2. That gives two valid total orders in total.

If Task 1 must come before both Task 2 and Task 3, Task 1 has to be first. After placing Task 1 at the front, there’s no restriction between Task 2 and Task 3, so they can appear in either order: Task 2 followed by Task 3, or Task 3 followed by Task 2. That gives two valid total orders in total.

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