S is a subset within a universal set, U. If S = {x, y, 4, 9,?), which could describe U? U = {keys on a keyboard} U = {letters} U = {numbers} U = {punctuation marks}

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Mathematics

6 March, 00:47

S is a subset within a universal set, U. If S = {x, y, 4, 9,?), which could describe U? U = {keys on a keyboard} U = {letters} U = {numbers} U = {punctuation marks}

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Fellow · Answer 1

S is a subset of U, so all of the elements of S must be also elements of U

If U was {letters}, 4, 9,? would not belong there

If U was {numbers }, x, y,? would not belong to U

If U was {punctuation marks }, 4, 9, x, y would not be in U

all the elements of S are in U={ keys on a keyboard}

Answer: U={ keys on a keyboard}