Which property justifies Step 2? Given: 4(x − 6) + 12 = 20
Step 1: 4x − 24 + 12 = 20
Step 2: 4x − 12 = 20
Step 3: 4x = 32
Step 4: x = 8
A) Substitution Property
B) Distributive Property
C) Addition Property of Equality
D) Subtraction Property of Equality

1. The principal has already selected a student from the voyagers, say Tom.

2.( Though it can ben Tom or the other 81 voyagers, it is often practical to make such assumptions, that is think "say the first selection was Tom from the voyagers"

3. Now the machine can again give the name of Tom. Now this is important, because we don't change the total number (the sample space) to 400-1=399. The sample space is still 400. 

4. P(voyager but not Tom)==