how many distinct positive integer- valued vectors (x1 , x2 , . . . , x6) satisfying(adsbygoogle = window.adsbygoogle || []).push({});

x1+ x2+. . .+x6 = 12 if 2 of xi must be = 1 ?

please help this question

book: A First Course in Probability (7th) by Ross

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# Statistics and Probability

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