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This problem trains for: SAT-I, AMC-8, GMAT, AMC-10.

How many six digit numbers are divisible by 10,000 and the sum of their digits is equal to 3?

To be divisible by 10,000, the last 4 digits must be 0. Therefore the first 2 digits must sum up to 3. Since the first digit cannot be 0, there are only three such numbers: 300,000, 210,000, 120,000.