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There are several first, second and third prizes in the contest. 1 / 2 of them win the first and second prizes, 8 / 9 of them win the second and third prizes, and some of them win the second and third prizes
1 / 2 plus 8 / 9, minus 1, equals 7 / 18, which is the share of the second prize in the total number of people
The sum of the two is equal to the first prize + second prize + second prize + third prize, and then minus (first prize + second prize + third prize), it is equal to the second prize!
Then 8 / 9 minus 7 / 18, equal to 1 / 2, is the third prize share of the total number of people~~~
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