Could you pass the 11-plus?

[andrewducker]

Check here - I got 13/15 - I ended up skipping questions 10 and 11 in order to finish inside the ten minute time limit.

Comments

[sigmonster.livejournal.com]

#13 has nothing to do with primes (31 is missing). They just chose to start on 17 because they are mean and horrid.

There are an awful lot of primes which differ by exactly 2; I think it's still open whether or not the number is infinite...