Question

3. Prove, by indirect proof, that if n is an integer and 3n+ 3 is odd, then n is even. Show all your work. (4 marks) MacBook Pro ps lock Command option control option command 20t3 la

Answer 1

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given 3n+3 is odd so 3(n+1) is odd
we know product of
even , even = even
odd, odd = odd
odd, even = even
even, odd = even
so for 3(n+1) to be odd n+1 should be odd then only 3*(n+1) will be odd
if n+1 is odd then n is even