The Mean Of Using Association With Importance And Probability

hi,
i have a exercise using association datamining
my database have 350 records,
i use 90 records for datamining and it release some rules which i choose on top of mSOLAP_NODE_SCORE,
but when i use select statement to check my result i have 1 records, the same as my result, and 5 records not true;
for example:
rules A=a,B=b-> C=c
select * from <my_table> where A='a' and B='b' and C='c'; ==>1 record return
select * from <my_table> where A='a' and B='b' and C<>'c'; ==>5 records return
C with 3 values c1,c2,c
with the second statement C includes 2 c1 and 3 c2

i don't understand how they work.
i want to choose some best rules can present my database.
how can i choose importance and probability to get best rules.
with database have 90 records and a database have 350 records which values i should use for minimum_probability, Minimum_Support, Minimum_importance...
when i choose rules i should choose on importance or probability.

thanks for your help