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Q: The tens digit and the ones digit of a certain number are equal The sum of the squares of the digits of the number is 50 What is the number?

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987654321 is the highest nine-digit number with no repeated digits.

The largest ten digit number with no repeated digits is '9876543210'.

Since there are only five different digits, a 6-digit number can only be generated if a digit can be repeated. If digits can be repeated, the smallest 6-digit number is 111111.

102 is the smallest three digit number with different digits.

The greatest 4-digit number with no repeated digits is... 9876

It can have up to 5 digits.

The largest number with no repeated digits is 9,876,543,210 although it is 10 digits long, the largest 3 digit number with no repeated digits is 987

The largest ten digit number with no repeated digits is '9876543210'.

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