2. a) Use the principle of mathematical induction to prove the statement: 6 7" – 2· 3" is divisible by 4 for all integers n 2 1. b) Show that postage of 12 cents or more can be achieved by using only...

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Extracted text: 2. a) Use the principle of mathematical induction to prove the statement: 6 7" – 2· 3" is divisible by 4 for all integers n 2 1. b) Show that postage of 12 cents or more can be achieved by using only 3 -cent and 7- cent stamps.