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skg94
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Homework Statement
1.How many 4 digit even numbers greater than 5000 can you form using the digits 0,1,2,3,5,6,8 and 9 without repetitions? How do i go about this?
b) how many of these numbers end in 0?
2. n_P_3=120
3. How many ways can all the letters of aloha be arranged if each arrangment must begin with a vowel and the consonants cannot be together?
Homework Equations
The Attempt at a Solution
1. I am doing the cases, and i set it up as 1*7*6*2 + 3*7*6*3 which isn't right
answer is 420, b) is 120
2. n!/(n-3)! = 120 = n(n-1)(n-2)=120 doesn't make sense from here.
answer is 6
3. I was thinking 3*4*2*1 = 24 which isn't right either. answer is 18