Use the definition of divisibility to justify your answers to the following questions. a. Is 42 divisible by 14? b. Does 7 | 56? c. For every integer k, does 3 divide (3k + 1) (3k + 2) (3k + 3)? d. Is-5 a factor 45? e. Is 6a (a + b) a multiple of 3a?

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