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Title: Combination or permutations Post by: hsedward on Jun 4, 2021 Determine the number of 4 -letter arrangements that can be formed with the letters of the name HILBERT. Each letter can be used only once and the arrangement must have the following: a) contain only consonants b) begin and end with a consonant c) begin with a vowel d) contain the letter B ) begin with L and end with a vowel ) begin with a consonant and end with E
Title: Re: Combination or permutations Post by: bio_man on Jun 4, 2021 Hi hsedward (https://biology-forums.com/index.php?action=profile;u=1007511)
I used the fundamental counting principal here. They are not asking for probability or anything... a) contain only consonants H, L, B, R, T 5 * 4 * 3 * 2 = 5! = 120 b) begin and end with a consonant 5 * 2 * 4 = 40 c) begin with a vowel 2 * 5 * 4 * 3 = 120 d) I'm confusing by the way the question is written. |