There are 2892 digits.
There are 120 of them.
There are 31 of them.
How many
10000
There are 125 of them.
There are 116 1s in the first 1000 digits of pi.
Not couting 1 and 1000, there would be 998 numbers.
Infinitely many. The number pi , for example, is between 1 and 1000 and, since pi is a transcendental number, it contains infinitely many digits. Plus, there are all the irrational numbers - each with infinitely many digits, and all the rationals with recurring decimals - again with infinitely many digits.
1100
4
2625
10 of 1 digit, 45 of 2 digits and 120 of 3 digits making 175 in all.
1000
There are 120 of them.
How many strings of three digits are there? 000 to 999, or a total of 1000. How many strings of three digits contain the same three digits? That's 000, 111, 222 ... 999! ten in total. The difference is your answer: 1000-10 = 990.
123
1000