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Suppose 9*(n-1) + 9*n + 9*(n+1) = 243
then dividing by n, (n-1) + n + (n+1) = 243/9 = 27
that is, 3n = 27 and so n = 9
So the three numbers are 9*8, 9*9 and 9*10 ie 72, 81 and 90.
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∙ 10y ago
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