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brilliants [131]
2 years ago
6

Find the value of x and y.​

Mathematics
1 answer:
Leya [2.2K]2 years ago
6 0

Answer:

??

Step-by-step explanation:

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A shop has 8 different types of postcards and at least 13 of each type. how many selections of 12 postcards are there if
Zolol [24]

Answer:

Answered

Step-by-step explanation:

It is a combbinatorics problem. let's think as we need to do 8 partitions  

of these 13 to separate the postcards of different types. So The number of

partitions of n=13 into r=8 terms counting 0's as terms as  C(n+r-1,r-1)​.

(a)

Here n=13 and r=8, put it in the above formula so we get C(13+8-1,8-1)= C(20,7)= 77520 selections.

b).

Here, either (i) we can choose none of type I or (ii) we choose one of type I

Case(i): r=7, n=12 (Here we have only 7 types to choose from​)

Case(ii): r=7, n=11 (Here we have only 11 cards to choose and only 7 types to choose them from)​

Case (i) + Case(ii) = ,C(12+7-1,7-1) + C(11+7-1,7-1) = C(18,6) + (17,6) = 18564+12376 = 30940 selections.

4 0
3 years ago
The area of a square is 36 square cenitmeters what is the length of each side of the square​
Kipish [7]
My answer is 9
(Could be wrong)
5 0
3 years ago
Read 2 more answers
One half hour past midnight
Zielflug [23.3K]

one half hour past midnight is 1:00

one o clock


3 0
3 years ago
Read 2 more answers
Write the equation of the line
Neporo4naja [7]

Answer:

y=-3/2x+4

Step-by-step explanation:

line is negative, going 3 over 2. y intercept is 4.

3 0
3 years ago
Simplify: ? (10x = 105 - (12x – 247)​
Greeley [361]

Answer:

x = 16

Step-by-step explanation:

10x = 105 - (12x - 247) //Distribute - sign

10x = 105 - 12x + 247 // Add 12x & combine like terms

10x + 12x = 352

22x = 352 //Divide 22

x = 352/22

x = 16

7 0
3 years ago
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