BB Math Number 14, page 778

Test Preparation SAT Preparation
1

<p>The three distinct points P, Q, R lie on a line l; the four distinct points S,T,U, V lie on a different line that is parallel to line l. What is the total number of different lines that can be drawn so that each line contains exactly two of the seven points?</p>

<p>I found the answer just listing it after drawing the diagram but is there a way to do it with combination since there are pre-requisties and you can't just do 7C2</p>

2

<p>the answer to that was 12 right? So it would be 4 times 3…duh!!!
But you would do 4 times 3 because each of the 4 points has to match each of the three points in DIFFERENT combinations. so just multiply</p>

3

<p>4 times 3…</p>