You can get the sum of number sets by adding up the numbers. For exmaple , a number set (3 7 12 23 31 37) which has a sum of 113.
Why look at sum of number set?
For exmaple, you check out the sum for the lottery
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Singapore TOTO
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Sports TOTO 6/42
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Hong Kong
You will notice that the sum is usualyy within 100-199. Of course, you can try to narrow the range of the sum (140-180) to get a higher chance. So if you buy a number set that has a sum out of this range, you chance of striking the jackpot is lower.