How many numbers lying between 600 and 700 can be formed with the digits 0-9, where 7 occurs at exac….

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How many numbers lying between 600 and 700 can be formed with the digits 0-9, where 7 occurs at exactly one of the positions (repetition is allowed)?

Options :-

1. 18
2. 63
3. 16
4. 54

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