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For example, there are n = 10 participants in the lottery coupons are numbered from a = 1 to b = 10. The sums of the digits of each coupon are [1,2,3,4,5,6,7,8,9,1]. Any sum from 2 to 9 has only 1 winner. If the sum of digit is 1, however, there are two winners, tickets 1 and 10. The answer is s = 1 with two participants winning the lottery.
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