2 out of 3
How many triples of points are there in this 4×4 array that lie on a straight line?
3 out of 3
To win on a scratch card you have to uncover three numbers that add up to more than fifteen. What is the probability of winning a prize?
3 out of 3
At how many times between 10 and 11 o'clock are all six digits on a digital clock different?
3 out of 3
The teacher has forgotten which pupil won which medal. In how many different ways could he give the medals out to the pupils?
3 out of 3
From this sum of powers, can you find the sum of the indices?
3 out of 3
Weekly Problem 26 - 2008
If $n$ is a positive integer, how many different values for the remainder are obtained when $n^2$ is divided by $n+4$?
3 out of 3
You have twelve weights, one of which is different from the rest. Using just 3 weighings, can you identify which weight is the odd one out, and whether it is heavier or lighter than the rest?
3 out of 3
Tina has chosen a number and has noticed something about its factors. What number could she have chosen? Are there multiple possibilities?
3 out of 3
How many different phone numbers are there starting with a 3 and with at most two different digits?
1 out of 3
Five equations and five unknowns. Is there an easy way to find the unknown values?
