SOLUTION: if the larger of two consecutive whole numbers has one more digit than the smaller, then the sum of their ones' digits is _____ A)10 B)9 C)1 D)0

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Question 562479: if the larger of two consecutive whole numbers has one more digit than the smaller, then the sum of their ones' digits is _____
A)10 B)9 C)1 D)0
Answer by MathHelper7(6) About Me  (Show Source):
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It cannot be 10 because 10 is not a single digit. The answer is C.