Hi Mathal,
I don't know, either.
:smile:
But I would like to point out that "the largest necessary" is equivalent to "the smallest enough".
Maybe someone doesn't understand this.
That's right, the way puzzles are worded matters a lot!
And it seems you have correctly understood my puzzle.
However, the answer to your version (which has nothing to do with the original idea) is "ONE" .
If, for instance, 23 members had voted for a movie, then there would be one member who...
John = {head,body,arms,legs}
class_01 = {Mary, Lucy, John}
John is a student, and class_01 is a set of students.
Is the head of John a student?
Is the head of John a student of class_01?
The head of John is not an element of the class_01.
Each one of the 23 members of a moviegoers' club has selected his two favorite movies from a 50 movies list.
It is noted that any two members have at least one favorite movie in common.
What is the largest number of members that have necessarily selected a same movie?
Prove that.
Hi Saugata Bose!
A digital image (acquired with a digital camera or a scanner, for example) is just a file which describes all the pixels (picture elements) of the image.
The "format" of such files is the way the pixels are described.
Commonly there is a "file header" based on: the size of...
You could compare the average luminances (and their standard deviations) of the two images, for example.
Or the chrominances, if you prefer... :smile:
http://en.wikipedia.org/wiki/RGB_color_model
http://en.wikipedia.org/wiki/HSL_and_HSV
Once, while visiting Fermat, Chuck Norris showed him a wonderful math proof on Numbers Theory, occupying about half page.
He took back the paper when left.