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  3. 2. [6 marks] (induction) prove that 21 divides 4n+

2. [6 marks] (Induction) Prove that 21 divides 4n+1 + 5 2n?1 whenever n is a...

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Advance Math

2. [6 marks] (Induction) Prove that 21 divides 4n+1 + 5 2n?1whenever n is a positive integer. HINT: 25 ? 4(mod 21)

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