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How many 4-letter words can we make from the letters A, B, C, and D, we are allowed to repeat letters, and we must use the letter B at least once ? (Show 2 different methods clearly

 Feb 14, 2022
 #1
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You have to think of a logical method that might work.

 

Suggestion

Hoe many ways if only one letter is used

How many ways if 2 letters are used

How many ways if 3 letters are used

How many ways if 4 letters are used.

 

Thinks about that and come back with some of your own input.

 Feb 14, 2022

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