From a class of 12 boys and 10 girls, 10...

From a class of 12 boys and 10 girls, 10 students are to be chosen for a competition, at least including 4 boys and 4 girls. The 2 girls who won the prizes last year should be included. In how many ways can the selection be made ?

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MODERN PUBLICATION-PERMUTATIONS AND COMBINATIONS-EXERCISE

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