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Tutors Answer Your Questions about Permutations (FREE)
Question 241278: You order twelve burritos to go from a Mexican restaurant, five with hot peppers and seven without. However, the restaurant forgot to label them. If you pick three burritos at random, find the probability that at least two have hot peppers. (Round the answer to three decimal places.)
My mother told me 0.36 but my teacher said it was wrong. Could you please help me.
Click here to see answer by Theo(674)   |
Question 236899: Prove that there must be at least 2 students at a college with the same last four digits of a social security number
So far, I've tried reasoning that there are 10 possible digits, and i have to choose 4 of them, so it would be a combination/permutation of 10 choose 4. (i'm not sure which one it is though) and where do I go from there
Click here to see answer by edjones(3292)  |
Question 236899: Prove that there must be at least 2 students at a college with the same last four digits of a social security number
So far, I've tried reasoning that there are 10 possible digits, and i have to choose 4 of them, so it would be a combination/permutation of 10 choose 4. (i'm not sure which one it is though) and where do I go from there
Click here to see answer by scott8148(3382)  |
Question 233437: 16) In how many ways can 7 people be chosen and arranged in a straight line, if there are 9 people from whom to choose? 16) ______
A) 72 ways B) 63 ways
C) 144 ways D) 181,440 ways
*****AM I USING PERMUTATION, COMBINATIONS or is it 9*7=63?******
Click here to see answer by Theo(674) |
Question 232654: I am going to ask four questions. My questions are on the counting method, I have a test on it very soon and if you guys could anwser and explain asap that would be great :)
1. Jeff Hubbard, a contractor. builds homes of eight diffrent models and presently has five lots to build on. In how many diffrent ways can he arrange homes on these lots?Assume five diffrent models will be built.
2. The ten longest broadway run includes the phantom of the opera and les miserables.Four of teh ten are chosen randomly. ( assume order is not important)
(a) how many ways can the four be chosen?
(b) How many of those groups of four would include niether of the two productions mentioned?
(c)How many of them would include atleast one of the productions mentioned?
3.Judy zahrndt wants to name her new baby so that his monogram(first.middle, and last initials) will be distinct letters in alphabetical order and he will share her last name. How many diffrent moograms should she select?
Click here to see answer by stanbon(26259)  |
Question 232096: The number of people on the school board is represented by x. Two subcommittees with an equal number of members are formed, one with (2/3)x – 5 members and the other with (x/4) members. How many people are on the school board?
Click here to see answer by checkley77(7035) |
Question 231962: My teacher and I cannot figure this out. Please help us.
A lodge has 50 members of whom six are physicians. In how many ways can you choose a committe of 10 that the committe contains at least three physicians?
Click here to see answer by scott8148(3382) |
Question 229101: How many combinations of three digits can be made from the numbers 0-9 without repetitions?
Please correct my answer if its wrong.
n=10
r=3
nPr=(n!)/(n-r)!
= (10!)/(10-3)!
= (3,628,800)/ (7)!
= (3,628,800)/5040
= 720
Click here to see answer by stanbon(26259) |
Question 228487: There are 12 questions on an examination and each student must answer 8 questions including at least 4 of the first 5 questions. How many different combinations of questions could a student choose to answer?
Click here to see answer by stanbon(26259) |
Question 227895: Social Security numbers are in the form ###-##-####, where each symbol represents any number 0-9. How many Social Security numbers are possible using this format? Will we ever run out of Social Security numbers?
Would it be 90 factorial? Thank you.
Jim
Click here to see answer by Alan3354(6060)  |
Question 227480: Mr. Wu’s biology class is writing group reports about
the Hawaiian Islands. He has a total of 10 groups.
Mr. Wu will assign an island and a topic at random
to each of the groups. No two group assignments will
be the same.
Five Islands: Hawaii, Maui, Lanai, Oahu,
or Kauai
Topics: Plant Life or
Animal Life
Linda and Kim are in different groups, but they both
want to write about Kauai. What is the probability
that both Linda’s and Kim’s groups will receive Kauai
assignments?
A.1/5
B.1/45
C.1/50
D.1/90
Click here to see answer by edjones(3292) |
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Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720
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