Algebra III

How many positive odd integers less than 10,000 can be represented using the digits 0, 3, 6 an 9?

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  1. Last digit:0 or 9 (2 choices)
    second to fourth digits, 4 choices each.
    Total number of four digit odd integers
    =4*4*4*2
    =128
    (these include 9999 and 0009, etc.)

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