Question: How many strings of three decimal digits _______________________________? a) do not contain the same digit three times? b) do not contain the same digit twice?

How many strings of three decimal digits _______________________________?

a) do not contain the same digit three times?

b) do not contain the same digit twice?

c) begin with an odd digit?

d) have exactly two digits that are 5s?

e) end with an even digit?

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