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courtney's dad
Questions (2)
how many 5-digit palindromes exist?
i get 9*10*10*10*9=81000 is this correct? my thinking being that the first and last digit
1 answer
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hi all, thanks in advance for the help
How many even integers between 4000 and 7000 have 4 different digits? So, started by
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Answers (2)
well, i think i've figured this one out finally. the answer should be 1*1*10*10*9 because the 1st and second digits only have one possible number once the 4th and 5th digit are set. thanks to all that took time to look at this one for me. a really tired
oops, meant "counting" and permutations
