Asked by picklepeter
The number 55 was multiplied by a 55-digit number containing only ones. What is the sum of the digits of the result?
Answers
Answered by
oobleck
check with smaller numbers
55*11 = 605
55*111 = 6105
55*1111 = 61105
55*11111 = 611105
See a pattern? 6+(55-2)+0+5 = 64
55*11 = 605
55*111 = 6105
55*1111 = 61105
55*11111 = 611105
See a pattern? 6+(55-2)+0+5 = 64
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