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problem
Counting socks
11 to 14
Can you work out the smallest number of socks Rachel needs to take out of the box to be guaranteed a pair?
problem
Perfect score
11 to 14
Can you work out how many children answered all the questions correctly?
problem
The wrong stats
16 to 18
Why MUST these statistical statements probably be at least a little
bit wrong?
problem
Birthday party
11 to 14
The 30 students in a class have 25 different birthdays between them. What is the largest number that can share any birthday?
problem
Would you like a jelly baby?
11 to 14
What is the smallest number of jelly babies Tom must take, to be certain that he gets at least one of each flavour?
problem
One or both
14 to 16
Problem 1 was solved by 70% of the pupils. Problem 2 was solved by 60% of them. Can you work out how many pupils took the exam?
problem
Almost constant digits
11 to 14
How many 10-digit numbers containing only 1s, 2s and 3s can you write?