Mathematics, 19.09.2021 15:00 applejulianamoreno
Jacob writes N, a three-digit multiple of 7, on a whiteboard, then covers one of the digits with a piece of paper. Julie knows that N is a multiple of 7. No matter which of the three digits are being covered, if Julie looks at the board, she can be certain of the value of the digit that is being covered. How many possible values of N are there?
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Jacob writes N, a three-digit multiple of 7, on a whiteboard, then covers one of the digits with a p...
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