Question: An electronic gate can be opened by entering five digits on a keypad containing the digits 0,1,2,3,4,5,6,7,8,9. How many different keypad sequences are possible if

An electronic gate can be opened by entering five digits on a keypad containing the digits 0,1,2,3,4,5,6,7,8,9. How many different keypad sequences are possible if the first digit cannot be zero?

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