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svp [43]
3 years ago
13

In Dr. Mosley's waiting room, 4 magazines are scattered on the chairs. A patient named Tristan decides he probably has time to s

kim 3 magazines before his name is called. In how many orders can Tristan pick out 3 of the 4 magazines?
Mathematics
2 answers:
iragen [17]3 years ago
6 0

Answer: Tristan can pick them out in 6 different ways

Step-by-step explanation: In the waiting room the four magazines all have an equal chance of being picked first and then others would be picked subsequently. If we are to pick magazine A first of all, then the others would be picked as B, C and D, or C, B and D, or D, B and C, and so on.

However, rather than spend so much time counting the different ways we can apply the mathematical method of permutation. Since choosing the first one means we can’t choose it again but others have to be chosen, and all four magazines each has an equal chance of being chosen first, then the number of all possible permutations is given as 4! (four factorial).

The question requires us to chose three out of the four magazines, so we shall apply 3!.

3! = 3 x 2 x 1

3! = 6

Therefore, there are 6 different ways to pick three out of the four magazines

Annette [7]3 years ago
4 0

Answer:

24 ways

Step-by-step explanation:

Combination and permutations are quite alike but they still differ in several ways.

Just as combinations is only interested in arrangements, permutations wants both arrangements and order,but I'm going to give a proper definition of permutations since the question refers to order.

In mathematics, a permutation of a set is, loosely speaking, an

arrangement of its members into a sequence or linear order, or if

the set is already ordered, a rearrangement of its elements.

Permutations is assigned the formula

P= n!/(n - k)!

And since 4 newspapers are available to the patient and there is a need to know the order with which he skims three of those magazine, then we have

P= 4!/(4 - 3)!

= 4!/(1!)

= 4!

= 4 × 3 × 2 × 1

= 24 ways

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ziro4ka [17]

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108!

Step-by-step explanation:

8 0
2 years ago
PLEASE HELP ME URGENT
egoroff_w [7]

Answer:

Hello! answer: 39

Step-by-step explanation:

Formula for triangles area: base × height ÷ 2

Formula for squares area: base × height

5 × 3 = 15 15 ÷ 2 = 7.5 since there are 4 triangles that are the exact same I will just multiply by 4 so I have all the triangles so 7.5 × 4 = 30 now the square is just 3 × 3 so... 3× 3 = 9 now we add these up 30 + 9 = 39 therefore the surface area is 39

4 0
3 years ago
Read 2 more answers
Whats the answer someone help​
Tems11 [23]
The answer would be A
7 0
3 years ago
Pschological tests are often used to determine the hostility levels in people. High scores on the HLT pschological test correspo
algol13

Answer:  the correct answer is we are 95% confident that there is no statistically significant difference in the mean treatment  methods for hostility.  

Step-by-step explanation:

1)  Test for the equality of variances in the two groups to choose the appropriate t-test.  

H0: σ (1)^2 = σ (2)^2  

Ha: σ (1)^2 ≠ σ (2)^2  

Larger variance = 64  

Smaller variance = 49  

F = 1.30612  

Degrees of freedom 15 and 9  

Critical F from the table (with alpha=0.05) = 2.58  

Calculated F is smaller than critical F, so we use the pooled variance t-test.  

Sample 1 size 7  

Sample 2 size 8  

Sample 1 mean 79  

Sample 2 mean 84  

Sample 1 S.D. 7  

Sample 2 S.D. 8  

Pooled S.D = [(n1-1)s1^2+(n2-1)s2^2]/(n1+n2-2)

Pooled variance s = [(6)(49)+(7)(64))] / (13) =  (294+448)/13=742/13=57.076923

Pooled variance s^2 = 57.076923  

Standard error of difference in means = sqrt(1/n1+1/n2) times sqrt(s^2)  

Standard error of difference in means = (0.517549)(7.554927) = 3.910046 (denominator of t)  

Confidence interval = (mean1-mean2) +/- t SE  

t is the critical t with 24 degrees of freedom = 2.056  

(79 - 84) +/- (2.056) (3.910046)  

= (-13.04, 3.04)  

Interval encloses 0  

We are 95% confident that there is no statistically significant difference in the mean treatment  methods for hostility.  

4 0
3 years ago
We call a number peachy if every digit in the number is either a 3 or next to a $3.$ For example, the numbers 333, 83, 303 and 3
Kobotan [32]

Answer:

18

Step-by-step explanation:

33-1

3r-9

r3-8

r means random digit

9+8+1=19

7 0
3 years ago
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