The total number of four-digit odd numbers that can be formed using 0, 1, 2, 3, 5, and 7 (repetition allowed) is

216

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375

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400

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720

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Solution

The correct option is D 720
Thousands place can be filled with any of the digits 1, 2, 3, 5, 7 i.e., in 5 ways.
Hundredth and tenth place can be filled with any of the digits in 6 ways.
Unit place can be filled with any of the digits 1, 3, 5, 7 i.e., in 4 ways.
$∴$ Total number of numbers = $5 \times 6 \times 6 \times 4 = 720$

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