Home ยป Tricky Riddles ยป All the electricity was out in town and none of the street lights or traffic signals had power. A dark limousine was crui...

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Two little holes in the side of a hill riddle answer

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When the celebrated German mathematician Karl Friedrich Gauss (1777-1855) was nine he was asked to add all the integers from 1 through 100. He quickly added 1 to 100, 2 to 99, and so on for 50 pairs of numbers each adding to 101. Answer: 50 X 101=5,050. What is the sum of all the digits in integers from 1 through 1,000,000,000? (That’s all the digits in all the numbers, not all the numbers themselves.)

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