Combinations

problem

Satnav Dilemma

Age

11 to 14

Challenge level

1 out of 3

How many routes are there in this diagram from S to T?
problem

Negative Dice

Age

11 to 14

Challenge level

1 out of 3

If the odd numbers on two dice are made negative, which of the totals cannot be achieved?
problem

Colour Building

Age

11 to 14

Challenge level

1 out of 3

Using only the red and white rods, how many different ways are there to make up the other rods?
problem

Making 11p

Age

11 to 14

Challenge level

1 out of 3

How many ways are there to make 11p using 1p, 2p and 5p coins?
problem

Royal Arm Wrestling

Age

11 to 14

Challenge level

1 out of 3

How many arm-wrestles will there be in the royal arm wrestling championship?
problem

Island Hopping

Age

11 to 14

Challenge level

1 out of 3

What is the smallest number of ferry trips that Neda needs to take to visit all four islands and return to the mainland?
problem

Colourful Tiles

Age

11 to 14

Challenge level

1 out of 3

Weekly Problem 21 - 2011
How many ways can you paint this wall with four different colours?
problem

Unequal Exam

Age

11 to 14

Challenge level

1 out of 3

120 students sit an exam with 100 marks available. What is the smallest number of pairs that are awarded the same mark?
problem

Pattern of Islands

Age

11 to 14

Challenge level

2 out of 3

In how many distinct ways can six islands be joined by bridges so that each island can be reached from every other island...
problem

Flight of the Flibbins

Age

11 to 14

Challenge level

2 out of 3

Blue Flibbins are so jealous of their red partners that they will not leave them on their own with any other bue Flibbin. What is the quickest way of getting the five pairs of Flibbins safely to the new planet?