90 pupils were asked whether they owned a laptop or a tablet device. 52 said they owned a laptop. 45 said they owned a tablet. 23 said they owned both. Find the probability that a pupil chosen at ...

Refresh your knowledge with these guides on factor trees and writing numbers as a product of prime factors. List the factors of each number. Compare the lists to find the greatest number common to ...

Neil Gordon does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond their ...