Question

How many $4$-digit numbers that do not have $5$ and have $7$ in the hundreds position?

score 115 · Answer 1 · 2018-04-14 23:04:44

115

Views

How many $4$-digit numbers that do not have $5$ and have $7$ in the hundreds position?

Published on 14 Apr 2018 - 23:04

score 323 · Answer 2 · 2018-04-14 23:36:58

323

Views

Number of Combinations when order is irrelevant and there are repeated elements.

Published on 14 Apr 2018 - 23:36

score 660 · Answer 3 · 2018-04-15 02:01:32

660

Views

What is the probability that three randomly chosen computers were not tested?

Published on 15 Apr 2018 - 2:01

score 372 · Answer 4 · 2026-03-28 10:03:47

372

Views

Combinations with words in the alphabet

Published on 28 Mar 2026 - 10:03

score 63 · Answer 5 · 2026-03-25 17:21:53

63

Views

Strange distribution of triangle shapes connecting the leaves of a perfect $k$-ary tree

Published on 25 Mar 2026 - 17:21

score 1.9k · Answer 6 · 2018-04-15 02:22:38

1.9k

Views

Probability of being dealt a pair in a poker hand

Published on 15 Apr 2018 - 2:22

score 37 · Answer 7 · 2018-04-15 02:30:39

37

Views

Number of certain type of words

Published on 15 Apr 2018 - 2:30

score 1.9k · Answer 8 · 2026-03-26 01:00:28

1.9k

Views

Find 'ordinary generating function': 1, 0, 2, 0, 3, 0, 4, 0, 5....

Published on 26 Mar 2026 - 1:00

score 453 · Answer 9 · 2018-04-15 03:13:09

453

Views

Combination Question (Red and Blue team)

Published on 15 Apr 2018 - 3:13

score 351 · Answer 10 · 2018-04-15 05:23:38

351

Views

What is the probability that a random simple graph on [n] is a tree?

Published on 15 Apr 2018 - 5:23

score 58 · Answer 11 · 2018-04-15 05:58:08

58

Views

What is the gender distribution of mice in seven generations?

Published on 15 Apr 2018 - 5:58

score 1.1k · Answer 12 · 2018-04-15 06:11:08

Place b blue balls and r red balls in a box. Prove that the probability that the kth ball taken from the box is blue is the same for 1 ≤ k ≤ b.

score 45 · Answer 13 · 2018-04-15 11:26:54

45

Views

Likelihood of N runs given a certain set of black and white balls

Published on 15 Apr 2018 - 11:26

score 250 · Answer 14 · 2026-03-25 15:58:17

250

Views

Is $\binom{n}{k}$ always considered polynomial?

Published on 25 Mar 2026 - 15:58

score 93 · Answer 15 · 2018-04-15 13:55:18

93

Views

Olympiad problem

Published on 15 Apr 2018 - 13:55

List Question

How many $4$-digit numbers that do not have $5$ and have $7$ in the hundreds position?

Number of Combinations when order is irrelevant and there are repeated elements.

What is the probability that three randomly chosen computers were not tested?

Combinations with words in the alphabet

Strange distribution of triangle shapes connecting the leaves of a perfect $k$-ary tree

Probability of being dealt a pair in a poker hand

Number of certain type of words

Find 'ordinary generating function': 1, 0, 2, 0, 3, 0, 4, 0, 5....

Combination Question (Red and Blue team)

What is the probability that a random simple graph on [n] is a tree?

What is the gender distribution of mice in seven generations?

Place b blue balls and r red balls in a box. Prove that the probability that the kth ball taken from the box is blue is the same for 1 ≤ k ≤ b.

Likelihood of N runs given a certain set of black and white balls

Is $\binom{n}{k}$ always considered polynomial?

Olympiad problem

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