user 42493

### Questions (49)

 21 Each person has at most 3 enemies in a group. Show that we can separate them into two groups where a person will have at most one enemy in the group. 5 A proof that $\sqrt{2}$ is not a rational number. 4 Given a positive number n, how many tuples $(a_1,…,a_k)$ are there such that $a_1+..+a_k=n$ with two extra constraints 3 prove 0.1234567891011… is a normal number 3 How to write the symbols to “generalize” symmetric difference of set?

### Reputation (413)

 +5 probability that the root of a quadratic equation is real 0 Probability that two persons meet +15 prove 0.1234567891011… is a normal number +5 How to write the symbols to “generalize” symmetric difference of set?

 1 How do I show the full solution for this? 0 Number of Linear Transformations having same Kernel space dimensions

### Tags (32)

 1 parametric 0 combinatorics × 4 0 probability × 22 0 abstract-algebra × 3 0 linear-algebra × 7 0 graph-theory × 3 0 statistics × 4 0 machine-learning × 3 0 proof-verification × 4 0 number-theory × 2

### Accounts (15)

 Mathematics 413 rep 22 silver badges1212 bronze badges Stack Overflow 154 rep 1111 bronze badges Travel 139 rep 33 bronze badges Computer Science 116 rep 33 bronze badges English Language Learners 108 rep 22 bronze badges