###### Asked in Math and ArithmeticStatisticsPrime Numbers

Math and Arithmetic

Statistics

Prime Numbers

# How many odd numbers between 10-1000 start and end with the same digits?

## Answer

###### Wiki User

###### June 22, 2008 8:33AM

11,33,55,77,99 = 5 101, 111, 121, 131, 141, 151, 161, 171, 181, 191 = 10 303.....393 = 10 505..... = 10 707..... = 10 909..... = 10

## Related Questions

###### Asked in Math and Arithmetic

### How many digits are there in the numbers 1 - 1000000?

There is 7 in 1000000
There is 9 in 1 - 1000000
1-9 : 9 digits
10-99: 2 * 90 = 180 digits
100-999: 3 * 900 = 2700 digits
1000-9999: 4 * 9000 = 36000 digits
10000-99999: 5 * 90000 = 450000 digits
100000-999999: 6 * 900000 = 5400000 digits
1000000: 7 digits
5,888,896 digits in total.
Or alternate way of calculating:
calculate 0 to 999999 first.
000000 - 999999: 1,000,000 *6 = 6,000,000 digits to start
0-99999: 100,000 start with 0.
0-9999: 10,000 start with 00
0-999: 1,000 start with 000
0-99: 100 start with 0000
0-9: 10 start with 00000
6,000,000 - 100,000 - 10,000 - 1,000 - 100 - 10 = 5,888,890
add 6 for the difference between 0 and 1,000,000, 6 digits:
5,888,896 digits in total.

###### Asked in Math and Arithmetic, Prime Numbers, Composite Numbers

### Can you put this number in order -11.111 -111.11 1.11 11.1 -11.1 -1.11?

Answer: I cannot answer this question. I do not know where the
numbers start and end.
Answer: Put negative numbers before positive numbers. For the
positive numbers, the one with the least digits is smaller. For the
same number of digits, compare each digit until you find a
different number of digits. For the negative numbers, it is the
opposite as for positive numbers.

###### Asked in Mobile Phones, Math and Arithmetic, Algebra

### Why mobile number have 10 digits?

Actually, it doesn't. At least, it is not 10 digits all over the
world. For example, in Bolivia, the mobile phone number has only 8
digits. The number of digits required (for any particular country)
can depend on the following:
The number of mobile phones (or similar devices) used. If in
some country you have, say, 5 million mobile devices, you need at
least seven digits.
Mobile numbers may have to start with certain digits. This may
require an additional digit. In the above example, if in a country
all mobile phone numbers start with 6, 7 or 8, then 7 digits are no
longer enough - the minimum requirement is 8 digits.
The numbers may be organized so that the first few digits
identify the phone company, or the geographical region. This also
tends to increase the number of digits, since some areas will have
few numbers, while others will have many.

###### Asked in Math and Arithmetic, Numbers , Irrational Numbers

### Is 0.01011011101111011111 rational or irrational?

All numbers with a finite number of decimal digits are rational.
Some that infinitely many decimal digits are rational as well. If
you mean to repeat the pattern, adding one more "1" every time,
then no, it is not rational - rational numbers repeat the SAME
sequence of digits over and over (for example, 0.1515151515...), at
least eventually (they may start with some digits that are not part
of the repeating part, such as 3.87112112112...).

###### Asked in Math and Arithmetic, Algebra, Numbers

### How many integers are there between 3000 and 6000 in which no digit is repeated?

3000 and 6000 both have 3 0's, so they are out. The numbers
between them all start with 3, 4, or 5, followed by 3 digits. There
are 9 possible digits for the hundreds place, which leaves 8 for
the tens and 7 for the units digit. The answer is therefore 3 x 9 x
8 x 7 = 1512
Answer 1
=======
There are 4 possible first digits, 9 possible second digits, 8
possible third digits and 7 possible 4 digits, making a total of 4
x 9 x 8 x 7 = 2016.