Answered

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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}

Sagot :

Keys on a keyboard because it can’t be letters because there are numbers and punctuation marks, it can’t be numbers because there are letters and punctuation marks, it can’t be punctuation merks either cause there are letters and numbers. So the only option left is keys on a keyboard cause it has all letters numbers and punctuation marks
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