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Q: If you write all the 3-digit numbers just once will you write each of the digits an equal number of times?

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There are nine numbers which contain only one digit. There are 90 numbers which contain two digits. There are 900 numbers which contain three digits. There is one number which contains four digits.Therefore, the number of digits is equal to (9x1)+(90x2)+(900x3)+4 = 2893 digits. If this includes spaces, there would be 999 spaces, therefore there would be 3892 keystrokes.

if the sum of the cubic value of each digit of a number is equal to the original number , then that particular number is an Armstrong number :-) Actually, Armstrong numbers are the sum of their own digits to the power of the number of digits.

I'm sure there are more than 2 prime numbers that are 400 digits long.

There are no three-digit numbers that equal 17. In fact, there are no numbers with more or less than two digits that equal 17. In fact, in the whole infinite supply of numbers, there is only one single number that equals 17. That number is . . . . . . . 17 .

A number with decimals (digits after the decimal point) is not equal to ANY whole number. You can round it to the nearest whole number, if you like - that's the closest you can get.

36

The number of significant digits in a number is equal to the number of non zero digits, unless the zeroes fall to the right of the decimal place and are written, in which case all numbers from the leftmost non zero to the right most digit are counted. So, 4200.0 would have five significant digits.

Armstrong numbers are those numbers which are equal to the sum of the digits of the number each raised to the power of the number of digits in the number itself. There are 14 Armstrong numbers in the range 1-5000, which are: 1, 2, 3, 4, 5, 6, 7, 8, 9, 153, 370, 371, 407, 1634.

I believe here are 51 such numbers.

The number is 36.

Two (or four) digits added together cannot equal 42. Two-digit numbers multiplied together cannot equal 82.

1348.

N squared would be used to find the square root of a number or numbers. In order to find the number of three digit numbers such that the sum of the square results of any two digits are equal to the third digit the use of the formula (HOE)squared=Hsquared*10000+2HE*100+Esquared is needed.

Expressed in digits, this is equal to 14,500,000.

26

8 is the same as the sum of the digits of its cube, 512.

A number with nonzero digits after the decimal points is not a whole number, and it isn't equal to any whole number.

3721

21.

none.

412

What! Even numbers never equal an odd number. Not ever!

The number is 36

There are 17 such numbers.

the line which divides the number into 2 equal halves is called symmetry in numbers example:- in digits 0 to 9 the symmetry of numbers are 0, 1, 3, 8.