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Four Shelf
How to Choose the Floating Shelf that is the Right Size for Your Flat Screen TV Wall Mount
The only real difference between the 36" and 48" floating shelf is the length of the glass shelf that sits underneath the television. The shelf arm pieces and hardware are identical. Deciding between these two shelves comes down to two things, the number of components you wish to put on your shelf and the size of your television.
Choosing a Shelf Size Based on Components
Regarding the components, the first thing to do is add up the size of your components (be sure to include the manufacturer's recommended circulation space). For example, a Sony Google TV box is 13" wide, a Playstation 3 is close to 14" wide for a total of 27 inches. Leaving space for air circulation and game controllers, a 36" shelf with suit these components.
In another example, take an HDTV receiver that is 17" wide, a Xbox 360 that on it's side is 13" wide and a 17" wide DVD or Blu-Ray player. The total width would be 47 inches wide and fit perfectly on a 48" shelf.
Regarding components, the rule of thumb is a 36" shelf for two components and a 48" shelf for three components. Be sure to check the exact sizes of the components that you have or will purchase when selecting your shelf and also, if you choose to stack components, it is not recommended that you exceed 30 lbs on the shelf.
Also bear in mind that the height of the floating shelf is adjustable and that certain components can be placed standing up like the Nintendo Wii.
Determining Shelf Size Based on TV Size
The general rule of thumb is that a 48" shelf should be used for flat screen televisions 42" and larger. Of course this is a subjective opinion based on a person's personal preference towards the look of the television when combined with the shelf. Use the examples below to give you a general idea of the aesthetic difference between the two shelf sizes.
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Twenty four books are placed at random in a shelf. Find the probability that three books shall be always tog?
always together*
assume that the 3 books are tied together as one,
then there are 21 other books, total 22
arrangements of 22 books = 22!
but the 3 tied books could be tied in 3! ways,
so specified arrangements = 3! * 22!
unrestricted arrangements = 24!
probability = 3!*22! / 25!
= 6 / (23*24*25)
= 1 / 2300
EDIT:
------
paula is right. an inadvertent error crept in.
the answer shd be 3!*22! / 24!
= 1/92
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Markham Ice Shelf