# discrete mathematics

Anonymous

Question description

1. (n3 + 5n) mod 6 = 0  , for all  n≥ 1

2. (42n– 1) mod 3 = 0 , for all n ≥ 1

3.  ..By using direct proof method , prove that:

a.   The product of an even number and an odd number is an even number

b.   For all integer number  a, if (a−2) mod 5 = 0  then  (a2 – 4) mod 5 = 0

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