A safety locker in a jewel shop requires a 4 digit unique code. the code has the digits from 0 to 9. How many unique codes are possible
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4 codes unique are possible
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Answer is 4, there would be code with 4 digit.
The unique code has 4 digits. Each digit is formed using any of the 10 numbers from 0 to 9.
∴ Single digit number can be formed in 10 ways. A double digit number can be formed in 10 × 10 ways.
A three digit number can be formed in 10 × 10 × 10 ways. A four digit number can be formed in 10 × 10 × 10 × 10 ways. = 10,000 waysRead more on
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