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A positive integer is a palindrome if it reads
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26 Aug 2021, 05:36
26 Aug 2021, 05:36
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53% (01:31) correct
46% (01:44) wrong based on 15 sessions
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A positive integer is a palindrome if it reads exactly the same from right to left as it does from left to right. For example, 5 and 66 and 373 are all palindromes. How many palindromes are there between 1 and 1,000, inclusive?
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108
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Re: A positive integer is a palindrome if it reads
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26 Aug 2021, 20:30
26 Aug 2021, 20:30
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Ks1859 wrote:
A positive integer is a palindrome if it reads exactly the same from right to left as it does from left to right. For example, 5 and 66 and 373 are all palindromes. How many palindromes are there between 1 and 1,000, inclusive?
Show: ::
108
Single digit numbers (_), we can pick from 9 numbers
2-digit numbers (_)(_), we can pick 9 numbers for the first blank and those 9 again for the second blank
So, (9)(1) = 9 numbers
3-digit numbers (_)(_)(_), we can pick 9 numbers for the first blank, 10 for the second blank and those 9 again for the third blank
So, (9)(10)(1) = 90 numbers
Total = 9 + 9 + 90 = 108
Re: A positive integer is a palindrome if it reads
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27 Dec 2024, 01:32
27 Dec 2024, 01:32
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Thanks to another GRE Prep Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).
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