Why? Added end to beg................2 - 11....working inwards.........there are five 13s.............5 * 13 = 65..........how do I know 6.5 is dead center of the numbers 2 - 11?..........................from 2 to 6.5..............is a distance of 4.5................from 6.5 to 11..........is a distance of 4.5...................6.5 + 4.5 = 11.........symmetry.............
A fast way to add 2 - 11........including the end and beg numbers......is just multiply 5 * 13..............
5 * 13 =
65
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