Ответ:
1Ск/n=18!/(18-4)!*4!=3060
2Ck/n=15!/(15-4)!*4!=1365
C+C=3060+1365=4425
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Ответ:
1Ск/n=18!/(18-4)!*4!=3060
2Ck/n=15!/(15-4)!*4!=1365
C+C=3060+1365=4425