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user1038665
  • Member for 12 years, 5 months
  • Last seen more than 9 years ago
6 votes
1 answer
9k views

Show that among 20 people there are either four mutual friends or four mutual enemies

6 votes
1 answer
17k views

How many strings of 8 English letters are there...?

6 votes
3 answers
25k views

Are there any efficient ways to tell if a graph has a Hamiltonian circuit?

5 votes
2 answers
28k views

How can the Laplace transform be used to solve piecewise functions?

5 votes
3 answers
67k views

How many different passwords of length 6 can be formed...

4 votes
2 answers
9k views

Probability of selecting particular object from a random selection of 2 boxes

4 votes
1 answer
14k views

Distinguishable/indistinguishable objects and distinguishable/indistinguishable boxes

4 votes
3 answers
3k views

Show that the set of all infinite subsets of $\mathbb{N}$ has cardinality greater than $\mathbb{N}$

4 votes
2 answers
7k views

Big O/little o true/false

4 votes
1 answer
457 views

$\textbf{Q}$ fails to prove some correct $\forall$-rudimentary sentence

3 votes
2 answers
170 views

Show there are a pair of sentences where the first says the second is provable and the second says the first is unprovable

3 votes
2 answers
401 views

If $T$ proves any incorrect $\forall$-rudimentary sentence, then $T$ is inconsistent

3 votes
3 answers
529 views

Is $L = \{(x,y,z) | x+y=z\}$ a regular language?

3 votes
1 answer
4k views

Using the Wronskian and finding a general solution to a system of ODEs

3 votes
1 answer
1k views

How many ways to make a password?

3 votes
3 answers
4k views

Inverse Laplace transform of fraction $F(s) = \large\frac{2s+1}{s^2+9}$

3 votes
3 answers
3k views

Intuitively explaining the difference between a combination and permutation

3 votes
3 answers
7k views

How Many Ways to Make a Pair Given Five Poker Cards

3 votes
2 answers
7k views

The probability of the union of two events

2 votes
1 answer
653 views

Find a particular solution for the differential equation $5y'' + 8y' + 8y = \cos^2(x)$

2 votes
3 answers
21k views

What is the number of five-card hands possible from a standard fifty-two card deck?

2 votes
1 answer
53 views

Solve equation for alpha

2 votes
1 answer
2k views

Using induction to show a greedy algorithm always makes the optimal task selection

2 votes
1 answer
860 views

How can I use the translation theorem to show that two inverse Laplace transforms are the same?

2 votes
2 answers
89 views

Describing the pattern in which iterations make two, cyclic sets equal

2 votes
1 answer
500 views

How many $2048$ bit primes with the form $2q+1$ are there?

2 votes
3 answers
10k views

Playing roulette

2 votes
2 answers
514 views

Can we intuitively say if two graphs are isomorphic?

2 votes
1 answer
6k views

How does Dijkstra's algorithm work?

2 votes
1 answer
3k views

Finding general solution to system of ODEs using complex eigenvalues