"Starting with three, every consecutive line has 2 less than twice the previous line."
this statement means that your staring line has 3 marbles. You multiply the 3 marblesby 2 so 3x2=6 And then you minus it by 2 6-2=4
which means that you'll get 4 marbles for the next line.
So to get your 6th line, you count how many marbles is on the 5th line but since your diagram doesn't have the 5th line you have to figure out the 5th line by counting how.many marbles is on the 4th line.
