NoBackingDown's user avatar
NoBackingDown's user avatar
NoBackingDown's user avatar
NoBackingDown
  • Member for 9 years, 8 months
  • Last seen more than 5 years ago
16 votes
3 answers
4k views

How many possible 10-card hands can be dealt from super deck?

10 votes
2 answers
16k views

Difference between two independent binomial random variables with equal success probability

8 votes
1 answer
17k views

Derivation of the third moment of Poisson distribution using Stein-Chen identity

7 votes
4 answers
10k views

Probability that a random 13-card hand contains at least 3 cards of every suit?

6 votes
2 answers
15k views

Probability of exactly one empty box when n balls are randomly placed in n boxes. [duplicate]

6 votes
1 answer
7k views

Birthday problem: Let X be number of people needed for a match. Find the PMF of X.

5 votes
1 answer
1k views

$A$: set of Alice's frieds, $B$: Bob's friends, $C$: all people. Find $P(A \subseteq B)$ and $P(A \cup B = C)$

4 votes
1 answer
4k views

Montmort's card matching problem: Distribution of the number of matching cards?

4 votes
2 answers
8k views

Possibilities for passwords with at least one lowercase and one uppercase letter [duplicate]

4 votes
1 answer
1k views

Jacobian for a matrix transformation: Example of Cholesky decomposition

4 votes
3 answers
3k views

Card Matching: expected value of correctly predicted cards with partial feedback

4 votes
2 answers
184 views

Simplifying $\sum_{j=k}^{n}\binom{j}{k}/(2^{k-1})$

4 votes
1 answer
3k views

Two series of independent Bernoulli trials. Find distributions of being simultaneously successful and of first success being simultaneous.

4 votes
2 answers
10k views

PDF of the ratio of two independent Gamma random variables

3 votes
1 answer
3k views

Committee of size k out of n couples selected, probability of exactly j couples in it.

3 votes
2 answers
3k views

Probability that no student sits on the same seat at two different days

3 votes
2 answers
3k views

Expected value of a die when decision to role again depends on previous outcome

3 votes
2 answers
4k views

Sum over product of two binomial distributions

2 votes
2 answers
2k views

Let $X \sim \text{HGeom}(w,b,n)$, what is the distribution of $n-X$?

2 votes
2 answers
426 views

Probability: k items assigned to n slot, find Pr. that at least 1 slot contains more than 1 item

2 votes
5 answers
4k views

Probability of no king, queen or jack before the first ace occurs?

2 votes
2 answers
2k views

Expected earning when Player B randomly guesses a number player A picked

2 votes
3 answers
489 views

Expected number of matching "cards". Why is $\sum_{m=0}^n D_{n,m} = \sum_{m=0}^n m \cdot D_{n,m}$?

2 votes
0 answers
85 views

Probability of a random point $(U_1,U_2, \cdots, U_n)$ with $U_j \sim \operatorname{Unif}(-1,1)$ being in unit sphere in $\mathbb{R}^n$

2 votes
1 answer
591 views

Poisson process problem; joint and marginal distributions of time till first event

2 votes
1 answer
231 views

For three i.i.d continuous random variables, exactly one is the minimum, almost surely

2 votes
0 answers
115 views

Show equivalence of statement $\left(P\rightarrow Q\right) \wedge \left(Q\rightarrow R\right)$ to ... [duplicate]

2 votes
1 answer
3k views

Algebraic numbers as roots of polynomials of degree $n$ are countable.

1 vote
0 answers
47 views

Possible number of configurations of $m$ pairs drawn from $n$ numbered balls with restriction

1 vote
2 answers
3k views

Let $X$ and $Y$ be i.i.d. $\operatorname{Geom}(p)$, and $N = X + Y$. Find the joint PMF of $X, Y, N$