[daok]

You probably do not have a child of 7 years old because they do not know at that age what is a prime number.

Second, basic math still that you never or rarely use or with very large time between usage might get rusty. You may understand the concept but not find the optimal solution. The way you are responding here shows quite a lot about how you are short sighted by instant-failing someone with a single question instead of trying to asses the whole person as much as you can. On you side, you are wasting opportunity to have a great person that could be a key player in your team by bringing other set of skill on the table.

[blibble]

> You probably do not have a child of 7 years old because they do not know at that age what is a prime number.

it's part of the curriculum for children of this age where I grew up (I did check)

> The way you are responding here shows quite a lot about how you are short sighted by instant-failing someone with a single question instead of trying to asses the whole person as much as you can. On you side, you are wasting opportunity to have a great person that could be a key player in your team by bringing other set of skill on the table.

it may also be the case that I have more in depth knowledge about the roles that I've interviewed candidates for

most recently: hiring people to work for quants

not instantly knowing that even numbers (other than 2) are not prime is a very strong signal

[hyperbovine]

> You probably do not have a child of 7 years old because they do not know at that age what is a prime number.

A few do. And in 20 years you're reallyreally going to want to hire them.