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How many string of 4 decimal digiys end with an odd or end with prime​

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Khabirabelviz

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How many strings of 4 decimal digits have exactly three digits that are 9s?

3. have exactly three 9s? There are 9 ways to pick the non-9 digit and 4 places to put it, so 9 · 4 = 36 in all.