about the three subsets X1, X2, and X3 that partition a set X, except assume that the number of elements in X1 is 6 times the number of elements in X2, the number of elements in X3 is 3 times the number of elements in X2, and n(X)=60. (1) n(X1)= (2) n(X2)= (3) n(X3)=

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