A string of 7 characters is formed by ordering the letters ABCDEFG.
- How many strings are possible?
- How many strings begin and end with a vowel?
- How many strings contain the substring ACE?
- How many strings contain both substrings AB and FG?
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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