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**ihavvaquestion** Investigate the questions in parts a and b by considering a number of examples

a. If a whole number is divisible both by 6 and by 2, is it necessarily divisible by 12?

b. If a whole number is divisible both by 3 and by 4, is it necessarily divisible by 12?

c. based on your examples, what do you think the answers to the questions in a and b should be?

d. Based on your answer to part c, determine whether 3,321,297,402,348,516 is divisible by 12 without using a calculator or doing long division. Explain your reasoning.