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Coder-Man
  • Member for 5 years, 5 months
  • Last seen more than 4 years ago
2 votes
2 answers
96 views

Given a number $n$, find $a$, such that digitSum($n-a$)+digitSum($a$) is maximum

2 votes
0 answers
258 views

Number of words in mumbo-jumbo tribe's language

1 vote
1 answer
53 views

How many ways are there to pick a lock?

1 vote
1 answer
35 views

Combinations of 7 people out of 30

1 vote
2 answers
50 views

In how many ways can I put 1 to 5 mirrors in 8 rooms?

1 vote
1 answer
81 views

Number repositioning

1 vote
1 answer
64 views

How to seat guests in circles of chairs if each one wants to have free seats to his left and right?

1 vote
1 answer
107 views

Whats the maximum number of parts $n$ circles can break up $\mathbb{R}^2$ into?

1 vote
2 answers
1k views

$n^2-n+2$ plane divisions by $n$ circles

1 vote
2 answers
32 views

All sorted tuples

1 vote
1 answer
64 views

Why does the triangle inequality imply that $|a-b|<c<a+b$?

0 votes
3 answers
77 views

Triangle inequality with a condition

0 votes
0 answers
71 views

Can 2 segments have only 2 common points?

0 votes
2 answers
163 views

How many passwords with one or more digits?

0 votes
2 answers
1k views

How many 9-digit numbers are there with an even digit sum?

-2 votes
1 answer
48 views

How many segments go through 2 parallel lines' points? [closed]