4. Prove: Vn e Z, if n>2 then n -1 is composite. 5. Prove: Va,b e Z, if a|b and a|c then a|(2b – 3c)

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ISBN:9780470458365
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Following is a Discrete Structure question.

4. Prove: Vn e Z, if n>2 then n -1 is composite.
5. Prove: Va,b e Z, if a|b and a|c then a|(2b – 3c)
Transcribed Image Text:4. Prove: Vn e Z, if n>2 then n -1 is composite. 5. Prove: Va,b e Z, if a|b and a|c then a|(2b – 3c)
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For (1),

We need to prove the following.

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