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Q: How many two digit whole numbers are increased by 18 when their digits are reversed?

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27

If the number with the digits reversed can have a leading 0 so that it is a 1-digit number, then 16. Otherwise 13.

The sum of all palindromic numbers from 1001 to 9999 is 495000.

Find a four digit number whose digits will be reversed when multiplied by nine?

47 Impossible problem!

The same as the number of two-digit numbers, since the last two digits must the same as the first two, only reversed. So I'll say there are 100 four-digit palindromes.

With 123 digits you can make 123 one-digit numbers.

The same as the number of two-digit numbers, since the last two digits must the same as the first two, only reversed. So I'll say there are 100 four-digit palindromes.

There are 5460 five digit numbers with a digit sum of 22.

The number you are looking for is 12. Reversing the digits gives you 21 75% of 12 is 9 12 + 9 = 21

The digits product of two digit has number four

93 (and 39).

The no. is 35.

An eight digit number with one zero cannot remain the same when its digits are reversed. It must have an even number of 0s.

There are 9 digits that can be the first digit (1-9); for each of these there is 1 digit that can be the second digit (6); for each of these there are 10 digits that can be the third digit (0-9); for each of these there are 10 digits that can be the fourth digit (0-9). → number of numbers is 9 × 1 × 10 × 10 = 900 such numbers.

5040 different 4 digit numbers can be formed with the digits 123456789. This is assuming that no digits are repeated with each combination.

27 three digit numbers from the digits 3, 5, 7 including repetitions.

Using the digits of 1345678, there are 210 three digit numbers in which no digit is repeated.

45

All the two digit prime numbers that can be reversed are 11, 13 and 31, 17 and 71, 37 and 73, and 79 and 97.

2

12689 14689 12489

73 is the largest two-digit number that is prime and has prime numbers for both of its digits.

2893 digits in all, made up as follows: 9 1-digit numbers (1 to 9) = 1*9 = 9 digits 90 2-digit numbers (10 to 99) = 2*90 = 180 digits 900 3-digit numbers (100 to 999) = 3*900 = 270 digit 1 4-digit number (1000) = 4*1 = 4 digits

It is -987. The smallest positive 3-digit integer with unique digits is 102.