2000
-4
10 possible numbers on each wheel equals 10x10x10 or 1000 combinations possible.
There are infinitely many possible answers. Two such are 1*18400 and 1000*18.4
Numbers above 99 and under 1000 are 3-digits, all 900 of them.
123
Not couting 1 and 1000, there would be 998 numbers.
They are 8 times 125 = 1000
Write down the numbers from 1000 to 9999.
There are infinitely many possible answers. Some of them are: 100*2 1000*0.2 (1/7)*1400
solution: we know that there are 25 prime numbers are between 1-100 and 168 prime numbers less than 1000. 100 x 100=10000(5 digits) 999 x 999=998001(6 digits) 1000 x 1000=1000000(7 digits) so our answer should be same as the number of prime numbers between 100 to 999. hence, 168-25=143. 143 prime numbers will be there less than 1000 whose square has 5 or 6 digits.
10*10*10
10001