How many odd numbers less than 1000 can be formed by using the
digits 0, 3, 5, 7 when repetition of digits is not allowed?
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03, 05, 07, 0357, 0375, 0735, 0753, 0537, 0573, 307, 305, 503, 507, 705, 703, 073, 075, 037, 035, 053, 057
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