Даны множества:X1, X2, X3, X4. Для каких из этих множеств множество Y является собственным подмножеством?
X1 = {0, #, b, $}; X2 = {3, #, b, 0}; X3 = {3, 0, $}; X4 ={b, $}; Y = {0, $}
X1 = {0, #, b, $}; X2 = {3, #, b, 0}; X3 = {3, 0, $}; X4 ={b, $}; Y = {0, $}
X1 = {a1, b2, c3, d4}; X2 = {a1, d4}; X3 = {a1, c3, d4}; X4 = {a1, e5, d4}, Y = {a1, d4}
X1 = {13, 15, 17}; X2 = {13, 17, 19, 21}; X3 = {13, 15, 19}; X4 = {13, 19}; Y = {13, 19}
X1 = {91, 31, 51, 71 }; X2 = {31, 71, 41}; X3 = {31, 91}; X4 = {31, 61, 91}; Y = {31, 91}
X1 = {-3.5, 5.5, -7.5, 9.5}; X2 = {-3.5, -7.5, 9.5}; X3 = {-3.5, 9.5}; X4 = {-3.5, 6.5,}; Y = {-3.5, 9.5}
X1 = {1, 5, 7, 9}; X2 = {1, 7, 9}; X3 = {1, 9}; X4 = {1, 6, 9}; Y = {1, 9}
X1 = {0, #, b, $}; X2 = {a, 3}; X3 = {3, 0, $}; X4={a, 0, 3}; Y = {0, 3}
X1 = {b1, c1, d1, a1}; X2 = {a1, c1, d1}; X3 = {d1, a1}; X4 = {a1, e1, d1}; Y = {a1, d1}
X1 = {3, a, b, 9}; X2 = {3, b, a}; X3 = {3, a, 4}; X4 = {3, 6, 9}; Y = {3, a}
X1= {0, a, b, 9}; X2 = {3, a, b, 0}; X3 = {3, a, 9}; X4 ={b, 3}; Y = {3, a}