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Omni-MATH / Let us call a positive integer [i]pedestrian[/i] if all its decimal digits are…

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Let us call a positive integer [i]pedestrian[/i] if all its decimal digits are equal to 0 or 1. Suppose that the product of some two pedestrian integers also is pedestrian. Is it necessary in this case that the sum of digits of the product equals the product of the sums of digits of the factors?

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