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 2 years ago
How many permutations of the letters ABCDEFG contain:
a.) the string BCD?
b.) the string CFGA?
c.) the strings BA and GF?
if you can explain, that would be awesome! Thank you kindly.
 2 years ago
How many permutations of the letters ABCDEFG contain: a.) the string BCD? b.) the string CFGA? c.) the strings BA and GF? if you can explain, that would be awesome! Thank you kindly.

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sauravshakya
 2 years ago
Best ResponseYou've already chosen the best response.0Did u mean BCD togther?

kropot72
 2 years ago
Best ResponseYou've already chosen the best response.2a.) Assuming "the string BCD" means the three letters are grouped together, the number of permutations of the 7 letters containing the string BCD will equal the possible number of permutations of the remaining 4 letters. Each permutation of AEFG can be placed in 5 possible ways relative to the string as follows: 1. 0 letters before the string 2. 1 letter before the string 3. 2 letters before the string 4. 3 letters before the string 5. 4 letters before the string Therefore the required number of permutations is: \[4!\times 5\]
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