Concept explainers
a. Is it true that a whole number is divisible by 6 exactly when the sum of its digits is divisible by 6? Investigate this by considering a number of examples. State your conclusion.
b. How could you determine whether the number 111,222,333,444,555,666,777,888,999, 000 is divisible by 6 without using a calculator or doing long division? Explain!
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