Q: What is the largest three digit number whose digits add to 20?

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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 three digit prime number whose digits are all primes is 773.

975

995

9998888

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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 number with three digits is 999.

The largest three digit prime number whose digits are all primes is 773.

975

995

9998888

It is 99,887,765

999 is the largest 3 digit number because each of the three digits is the largest possible value (9). Whole number simply means that there is no decimal part or fraction.

How about: 773

The largest single digit in our numerical system is 9. Once you write 10, you have two digits.

The greatest value a digit can have in base for is 3. Thus the largest three-digit number in base for would be 333. In base 10, this number is 3x16 + 3x4 + 3 = 63 Therefore 63 is the largest digit that would be three digits in base 4.

972.