The total number of four-digit odd numbers that can be formed using 0, 1, 2, 3, 5, and 7 (repetition allowed) is
A
216
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B
375
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C
400
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D
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 = 5×6×6×4=720