Use DEDUCTIVE reasoning to prove that this conjecture is true: The sum of the digits for any two-digit whole number multiplied by 9 will always be 9 if you keep adding the digits until they equal a single digit. example: 98 x 9 = 882 8+8+2 = 18 1+8 = 9 20 x 9 = 180 1+8+0 = 9

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A:

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