Formation of Possible Strings from the Letters ABCDEFG

Question

A string of 7 characters is formed by ordering the letters ABCDEFG.

  1. How many strings are possible?
  2. How many strings begin and end with a vowel?
  3. How many strings contain the substring ACE?
  4. How many strings contain both substrings AB and FG?

Summary:

This question belongs to mathematics and discusses about formation different strings from a string of 7 characters formed by ordering the letters ABCDEFG.

Total word count: 37

 

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Comments

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    Giuseppe

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