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The fifth line will have 19 marbles. 4 5 7 11 19
(21 + 21 + 19 + 19)/4 = 20
a line of fit mean perfect line.
A line is made up of a large (infinite) number of points. When we say a point is on a line, we mean that it is one of the pints that form the line.
19,000 in Roman numerals is XIX with a line over it. The line multiplies 19 to 19,000.