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To be palindromic, the year must be of the form XYYX where X and Y are digits, so we need only consider the first half of the number, namely the XY and the question becomes how many numbers XY are there between 20 and 99 such that XYYX is between 2000 and 9999.
The answer depends upon the definition of "between":
- If "between" means strictly between, that is the year cannot be 2000 or 9999
XY = 99 ⇒ 9999 = 9999 so not allowed
⇒ number of years is 99 - 20 = 79
- If "between" means between but also including the limits, that is the year could be 2000 or 9999
XY = 99 ⇒ 9999 = 9999 so still allowed
⇒ number of years is 99 - 20 + 1 = 80
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What is the sum of all 4 digit numbers that are the same when their digits are reversed?
The sum of all palindromic numbers from 1001 to 9999 is 495000.
How many palindromic numbers in 1000-10000?
11000
What is the difference between .999 and .9999 fine gold bar?
.9999 is 10 times purer (10 times less impurities).
What is largest 4 digit number?
9999
How many integers between 1000 and 9999 are palindromes?
90 palindromes.
What are the palindromic between 1000 and 9999 which is divisible by 45?
5445 is one that I can think of
How many palindromic years are there from 2000 to 9999ad?
That would be every number from 20 to 99 followed by the number backward (2002, 2112, 2222, 2332, ..., 9779, 9889, 9999). The quantity is 99 - 19 or 80.
What is the sum of all 4 digit numbers that are the same when their digits are reversed?
The sum of all palindromic numbers from 1001 to 9999 is 495000.
What is the difference between 9999 and 999.9?
The difference between 9999 and 999.9 is: 9999 - 999.9 = 8999.1
How many palindromic numbers in 1000-10000?
11000
How many 8 digit palindromic numbers are there?
a 8-digits palindromic number is a number consisting of a 4-digits number written and then written backward, i.e. 1234 4321 so there are as many palindromic 8-digits numbers as 4-digits numbers so from 1000 to 9999, so there are 8999 palindromic 8 digits number (I assumed that 00011000 is not to be considered as a valid 8 digit number)
How many whole numbers between 999 and 9999?
If by "between" you mean "between but not including", then the answer is 9999 - 999 - 1 = 8999.If on the other hand, you mean to include both 9999 and 999, then the answer is 9999 - 999 + 1 = 9001.
Story of Leonardo da Vinci?
his story was in the who cares era, in a summer of 9 99 999 9999 9999 9999 9999 years ago.
How many integers between 1000 and 9999 are divisible by 5 or 7?
There are 2828 integers between 1000 and 9999.
What are prime numbers from 1000 to 9999?
Prime No: between 1000 to 9999= 54_( 42x3)
How many palindromes between 1000 and 9999 inclusive are divisible by 9?
There are 10 palindromes divisible by 9 between 1000 and 9999.
What is the difference between .999 and .9999 fine gold bar?
.9999 is 10 times purer (10 times less impurities).
