How many words can you make using the letters of lead so that the vowels are together?
Answer Verified
Hint: The word daughter has $8$ letters in which $3$ are vowels. For the vowels to always come together consider all the $3$ vowels to be one letter (suppose V) then total letters become $6$ which can be arranged in $6!$ ways and the vowels themselves in $3!$ ways.Complete step-by-step answer: (ii)We have to find the number of words formed when no vowels are together. Note: Combination is used when things are to be arranged but not necessarily in order. Permutation is a little different. In permutation, order is important. Permutation is given by- Example from the textbook: Question: Sorry people I know most of u are too smart for this question, but I really need help so for questions c, d, e and f I have solved already, but I don't think my method of solving them is correct. G is the one I struggled for hours. info I already know 8 letters, 3 vowels (A,E,I) and 5 consonants (C,T,R,N,G) My Working Out for c, i did 3 x 4 x 5 x 4 x 3 which equals to 720 which is correct. for d, i did (3 x 4) - (2 x 3) first which equals to 6 I then multiply it by 3, 2, 5, 4 together therefore the final answer is 720. See in the first part I multiply 3 (the number of vowels) by 4 the number of position as any of the three vowels can fit in any of the 4 spaces. The questions asks for two vowels, since 1 vowel is already in one space the second vowel has two of the 3 vowels to take from and any of the two vowels can fit into the 3 remaining spaces. I subtract, because my intuition tells me to do so. for e, I did (3 x 4) - (2 x 3) - (1 x 2) first which equals to 4 I then multiply it by 3, 2, 1, 5 together, making the answer is 120 which is the right answer. Here, I follow the my own principle from d. So I'm not sure if I'm right. for f, I got the total arrangements from question a minus the total amount of words without vowels. To get the words without vowels i found all four letter arrangement words with consonants only which is 120. 1680 (from a) - 120 = 1560 (Correct) for g, I totally don't understand it, but the answer is 18 000. |