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anonymous
 one year ago
The following figure consists of 8 horizontal lines and 12 vertical lines. The goal of this problem is to count the number of rectangles (squares are a kind of rectangle, but line segments are not).
WebAssign Plot
Let V be the set of all sets of two vertical lines, and let H be the set of all sets of two horizontal lines. Let R be the set of all rectangles in the figure. Define a function
f : R → V × H
by
f
transform arrow
({AB, CD}, {AC, BD}).
Compute R, the number of rectangles in the figure.
anonymous
 one year ago
The following figure consists of 8 horizontal lines and 12 vertical lines. The goal of this problem is to count the number of rectangles (squares are a kind of rectangle, but line segments are not). WebAssign Plot Let V be the set of all sets of two vertical lines, and let H be the set of all sets of two horizontal lines. Let R be the set of all rectangles in the figure. Define a function f : R → V × H by f transform arrow ({AB, CD}, {AC, BD}). Compute R, the number of rectangles in the figure.

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dan815
 one year ago
Best ResponseYou've already chosen the best response.2okay i think i see what u have to do now, we have to go up the rows and the columns all separetely

dan815
 one year ago
Best ResponseYou've already chosen the best response.2i wrote it out, im thinking this should be written in a double summation, and then we can look for the clsoed form http://prntscr.com/7dphg2

ganeshie8
 one year ago
Best ResponseYou've already chosen the best response.1dw:1433570164316:dw

dan815
 one year ago
Best ResponseYou've already chosen the best response.2:O how is this formula in there

dan815
 one year ago
Best ResponseYou've already chosen the best response.2omg xD if we pick any 2 vertical lines and any 2 horizontal lines, we can have a unique intersection dang

dan815
 one year ago
Best ResponseYou've already chosen the best response.2whyyyyy didnnntt ii think of that sooner T_T

ganeshie8
 one year ago
Best ResponseYou've already chosen the best response.1that looks much simpler! nc2 ways to choose 2 vertical lines from n lines mc2 ways to choose 2 horizontal lines from m lines

dan815
 one year ago
Best ResponseYou've already chosen the best response.2yeah xD well this is a neat find either way lol

dan815
 one year ago
Best ResponseYou've already chosen the best response.2strange way to state it but ya
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