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Earn +20 ptsQ: What was the first number invented zero or digit?
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What was the first invented number?
The number zero was the first "invented" number.
What is smallest four digit number not using zero?
The smallest four-digit number not using zero is 1000. In a four-digit number, the first digit cannot be zero, so the smallest possible value for the first digit is 1. The remaining three digits can be any number from 0-9, so the smallest possible four-digit number is 1000.
How many significant digits are in the following number 7.0047?
5. Count the number of digits from the first non-zero digit to the last non-zero digit.
What is the least-four digit number with no repeated digit?
The key in this type of problems is to advance from left to right, and to use the smallest possible digit in each case. Thus, the first digit (from the left) has to be a one, since a number doesn't start with a zero; the next digit has to be a zero; etc.
There's a certain 10-digit number where that the first digit is equal to the number of zero is the number of 1's in the entire number where the 10th digit is the number of 9's in the number?
6210001000
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