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Because they're in multiples of three - a quick way to tell if a number is a multiple of three is to add up the digits and see if the digits add up to a multiple of three e.g 576, 5+7+6=18, 1+8=9, 9 is a multiple of three
it is 23 because 2+3 = 5
Six digits that add up to 59
Add the digits together. The sum of the digits of 23 is 5.