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There are 90 palindromes with 4 digits.
The first digit can be any digit from the set {1,2,3,4,5,6,7,8,9}.
With each choice of the first digit, the second can be any digit from the set {0,1,2,3,4,5,6,7,8,9}.
That makes 9*10 = 90 permutations for the first two digits. These determine the palindrome since the third and fourth digits are the same as the second and first, respectively.
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How many 4-digit numbers are palindromes?
There are 90 such numbers.
How many 4-digit palindromes are there?
There are 90 four-digit palindromes
How many 4 digit palindromes are multiples of 9?
Nine. The sum of the digits must be a multiple of 9; because of the repeated digits, this is only possible if the first two digits add up to 9.
What digits are always the same in a 4-digit palindrome?
None. 1221 and 3443 are both 4-digit palindromes but no digit has remained the same between the two. First and fourth, second and third.
What is the smallest 4 digit palindrome that is the sum of 2 3 digitit palindrome?
The smallest 4-digit palindrome is 1001. To find if it can be expressed as the sum of two 3-digit palindromes, consider the smallest 3-digit palindromes, which are 101, 111, 121, etc. The combination of 101 and 900 (another 3-digit palindrome) gives 1001, making 1001 the sum of two 3-digit palindromes. Thus, the answer is 1001.
How many 4-digit numbers are palindromes?
There are 90 such numbers.
How many 4-digit palindromes are there?
There are 90 four-digit palindromes
How many 5-digit palindromes are multiples of 9?
-4
How many palindromes are there between 900 - 1900?
-1000
How many 4 digit palindromes are multiples of 9?
Nine. The sum of the digits must be a multiple of 9; because of the repeated digits, this is only possible if the first two digits add up to 9.
What digits are always the same in a 4-digit palindrome?
None. 1221 and 3443 are both 4-digit palindromes but no digit has remained the same between the two. First and fourth, second and third.
What is the smallest 4 digit palindrome that is the sum of 2 3 digitit palindrome?
The smallest 4-digit palindrome is 1001. To find if it can be expressed as the sum of two 3-digit palindromes, consider the smallest 3-digit palindromes, which are 101, 111, 121, etc. The combination of 101 and 900 (another 3-digit palindrome) gives 1001, making 1001 the sum of two 3-digit palindromes. Thus, the answer is 1001.
How many 9 digit numbers are palindromes?
A 9-digit palindrome has the structure where the first five digits determine the last four digits in reverse order. The first digit must be from 1 to 9 (to ensure it's a 9-digit number), giving us 9 options. The next four digits (the second to fifth digits) can each be any digit from 0 to 9, providing 10 options each. Therefore, the total number of 9-digit palindromes is (9 \times 10^4 = 90,000).
How many 4 digit numbers can be formed with the numders 5678 among these 4 digit numbers how many are smaller than 7000?
24
How many 2 digit numbers contain the digit 4?
17
How many 4 digit numbers are possible with no two numbers being adjacent?
There are 2941 4-digit numbers such no two of its digits differ by 1.
How many different three digit palindromes can you make using only the digits 1and 2?
There are two possible digits for the first and last digit, and two possible digits for the centre digit, making 2 × 2 = 4 possible 3 digit palindromes from the set {1, 2}, namely the set {111, 121, 212, 222}.
