Mathematics
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Graham Kemp
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6,641 Answers

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123
What is the difference between independent and mutually exclusive events?
Sep 22 '14 at 5:46
50
Bayes' rule with 3 variables
May 14 '15 at 8:24
44
When to give up on a hard math problem?
Jun 4 '14 at 3:07
32
The “assumption” in proof by induction
Apr 15 '18 at 12:18
32
In proofs, are “for each” and “for any” synonyms?
Mar 18 '18 at 6:49
32
Is there any difference between $P$ and $\Pr$ to represent probabilities?
Jul 22 '14 at 23:59
31
Intuition for probability of drawing first ball = probability of drawing second ball
Aug 3 '17 at 3:36
29
In a proof by contradiction, what if both the proposition and its negation lead to contradictions?
May 29 '18 at 2:25
27
Given 10 white, 9 green and 7 black. In how many ways you can select one or more balls?
Mar 19 '16 at 13:20
23
Total number of unordered pairs of disjoint subsets of S
Apr 7 '15 at 5:34
22
Probability of drawing the Jack of Hearts?
May 22 '18 at 1:48
20
High school Math: confusion about the basic probability
Nov 16 '15 at 6:41
19
Proof of linearity for expectation given random variables are dependent
Jun 2 '16 at 23:58
19
How many words (i.e. not “math” symbols") should I use in my proofs? ${}{}$
Mar 21 '18 at 3:42
17
Probability of Head in coin flip when coin is flipped two times
Mar 28 '14 at 9:56
15
Unambiguous summation notation
May 31 '17 at 0:41
15
Prove that $E(X) = \int_{0}^{\infty} P(X>x)\,dx = \int_{0}^{\infty} (1-F_X(x))\,dx$.
Mar 9 '16 at 23:30
15
What does “dual” mean exactly in mathematics?
Nov 8 '15 at 6:50
15
Much less than, what does that mean?
Nov 7 '15 at 5:03
15
Simple Trig Equations - Why is it Wrong to Cancel Trig Terms?
Sep 1 '15 at 4:40
15
A coin is flipped ten times. What is the probability that the first three are heads if an equal number of heads and tails are flipped?
May 4 '15 at 0:57
15
What is the difference between singular matrices and degenerate matrices?
May 13 '14 at 3:03
14
Find joint distribution of minimum and maximum of iid random variables
Feb 2 '18 at 1:01
14
Why, logically, is proof by contradiction valid?
Mar 23 '18 at 0:31
14
Conditional expectation of random variable given a sum
Nov 7 '17 at 2:39
14
$4$ dogs have been born in the same week. What is the probability that they were born on different days?
Oct 19 '16 at 0:12
13
Complement Set of Cartesian product
Sep 12 '17 at 4:24
13
Monty hall problem probability 2/6?
Aug 7 '17 at 13:40
13
You are dealt five cards from a standard deck. What is the probability that you'll have at most three kings in your hand?
Mar 16 '16 at 3:09
13
The distribution of the minimum of two independent geometric random variables
Nov 27 '14 at 4:33
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