Weegy: Max's explanation of "sufficiency" is very good. P doesn't have to be true for Q to be true, therefore it's not necessary. [ The truth table for a logical implication is:
P|Q|P->Q
________
1|1|1
1|0|0
0|1|1
0|0|1
P -> Q is true when P is false. source: yahoo ] (More)

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