JEE Main 2002 Mathematics question

Total number of four digit odd numbers that can be formed using 0, 1, 2, 3, 5, 7 (using repetition allowed) are

Answer: (4)

Solution

Units place (odd): 1, 3, 5, 7 → 4 ways. Thousands place (non-zero): 1, 2, 3, 5, 7 → 5 ways. Hundreds and tens places: any of the 6 digits → 6 ways

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Question ID VK-037996