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X is the number of two-digit numbers for...

X is the number of two-digit numbers formed by 3, 5, or 7, when the repetition is allowed. Y is the number of two-digit numbers formed by 3, 5, or7, when the repetition is not allowed. Find by how much X exceeds Y.

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The correct Answer is:
3
The two-digit numbers with repetitions of the digit 3, 5, 7 are 33, 55, 77.
`therefore " The required numbers of numbers " =3`
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