A number theory problem by karandeep singh ludhar
Number Theory
Level
2
Which is the first number when written in words contains "a" in it ?
The answer is 1000.
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One, two , three, four, five, six, seven, eight, nine, ten, eleven, twelve, thirteen, fourteen, fifteen, sixteen, seventeen, eighteen, nineteen... no A. Twenty, thirty, fourty, fifty, sixty, seventy, eighty, ninety... no A. Therefore all numbers from 20 - 99 will not have an A. Hundred (numbers from 100 - 999 will not have an A), thousa- oh, an A. Therefore the first number would be 1 0 0 0 .