The subsets of the set {w, x, y} are {w}, {x}, {y}, {w, x}, {w, y}, {x, y}, {w, x, y}, and { } (the empty subset). How many subsets of the set {w, x, y, z} contain w ?
four
five
seven
Eight
sixteen
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{W}, {W, X}, {W, Y}, {W, Z}, {W, X, Y}, {W, X, Z}, {W, Y, Z} and {W, X, Y, Z) 排列组合题作不溜 只能用笨蛋枚举法
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{W}, {W, X}, {W, Y}, {W, Z}, {W, X, Y}, {W, X, Z}, {W, Y, Z} and {W, X, Y, Z) 排列组合题作不溜 只能用笨蛋枚举法
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