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First, visit — Monty Hall Problem. Don’t read past ‘Solution.’
Attempt to solve. Write down method of solution.
Read ‘Solution.’
Visit Wiki’s Monty Hall Problem.
Carry out ‘Simulation.’
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It is hardly easy to understand this author, but here is a PDF.
There is a nifty calc on stattrek.com
And then here is site relating to poker hands.
This PDF on Ace Distribution is somewhat readable.
Set Operations (A Wiki Rip)
There are ways to construct new sets from existing ones. Two sets can be “added” together. The union of A and B, denoted by A ∪ B, is the set of all things which are members of eitherA or B.
Examples:

 {1, 2} ∪ {red, white} = {1, 2, red, white}.
 {1, 2, green} ∪ {red, white, green} = {1, 2, red, white, green}.
 {1, 2} ∪ {1, 2} = {1, 2}.
Some basic properties of unions are:

 A ∪ B = B ∪ A.
 A ∪ (B ∪ C) = (A ∪ B) ∪ C.
 A ⊆ (A ∪ B).
 A ∪ A = A.
 A ∪ ∅ = A.
 A ⊆ B if and only if A ∪ B = B.
[edit]Intersections
A new set can also be constructed by determining which members two sets have “in common”. The intersection of A and B, denoted by A ∩ B, is the set of all things which are members of both A and B. If A ∩ B = ∅, then A and B are said to be disjoint.
Examples:

 {1, 2} ∩ {red, white} = ∅.
 {1, 2, green} ∩ {red, white, green} = {green}.
 {1, 2} ∩ {1, 2} = {1, 2}.
Some basic properties of intersections:

 A ∩ B = B ∩ A.
 A ∩ (B ∩ C) = (A ∩ B) ∩ C.
 A ∩ B ⊆ A.
 A ∩ A = A.
 A ∩ ∅ = ∅.
 A ⊆ B if and only if A ∩ B = A.
[edit]Complements
Two sets can also be “subtracted”. The relative complement of A in B (also called the set theoretic difference of B and A), denoted by B \A, (or B −A) is the set of all elements which are members of B, but not members of A. Note that it is valid to “subtract” members of a set that are not in the set, such as removing the element green from the set {1, 2, 3}; doing so has no effect.
In certain settings all sets under discussion are considered to be subsets of a given universal set U. In such cases, U \ A is called the absolute complement or simply complement of A, and is denoted by A′.
Examples:

 {1, 2} \ {red, white} = {1, 2}.
 {1, 2, green} \ {red, white, green} = {1, 2}.
 {1, 2} \ {1, 2} = ∅.
 {1, 2, 3, 4} \ {1, 3} = {2, 4}.
 If U is the set of integers, E is the set of even integers, and O is the set of odd integers, then the complement of E in U is O, or equivalently, E′ = O.
Some basic properties of complements:

 A ∪ A′ = U.
 A ∩ A′ = ∅.
 (A′)′ = A.
 A \ A = ∅.
 U′ = ∅ and ∅′ = U.
 A \ B = A ∩ B′.
Cartesian product
A new set can be constructed by associating every element of one set with every element of another set. The Cartesian product of two sets A and B, denoted by A × B is the set of all ordered pairs (a, b) such that a is a member of A and b is a member of B.
Examples:
 {1, 2} × {red, white} = {(1, red), (1, white), (2, red), (2, white)}.
 {1, 2, green} × {red, white, green} = {(1, red), (1, white), (1, green), (2, red), (2, white), (2, green), (green, red), (green, white), (green, green)}.
 {1, 2} × {1, 2} = {(1, 1), (1, 2), (2, 1), (2, 2)}.
Some basic properties of cartesian products:
 A × ∅ = ∅.
 A × (B ∪ C) = (A × B) ∪ (A × C).
 (A ∪ B) × C = (A × C) ∪ (B × C).
Let A and B be finite sets. Then
  A × B  =  B × A  =  A  ×  B .
A student mathematics resource in the form of a blog.