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Earn +20 ptsQ: How many four digit palindromes are perfect squares?
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How many four digit palindromes are there?
There is 90 four digit palindromes.
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 are all the four and five digit numbers that have a digit sum of 6 and are palindromes?
1221, 2112, 3003, 10401, 11211, 12021
How many four digit palindromic numbers are there?
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.
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