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Permutations and Combinations · Discussion forum

Hard Level Question 19 – answer, explanation & discussion

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Question 19 Back to Exercise

How many 5-digit palindromes are there (numbers that read the same backwards)?

  • A 1,000
  • B 90
  • C 900 Correct
  • D 9,000
Correct Answer: Option C

The first three digits fix the number

First: 9 ways (not 0), second 10, third 10

9 × 10 × 10 = 900

Answer: 900

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