Two fair coins are tossed at the same time. What is the probability they will both land as "HEADS"?
(A) 0 (B) 1 (C) 21 (D) 31 (E) 41
Want a route through all this instead of an archive? The track
puts 2,604 problems in a working order, from Junior Challenge level to the IMO shortlist.
Source: CEMC, University of Waterloo,
licensed CC-BY-NC-4.0.
Statement reproduced verbatim; metadata (topic, difficulty) added by this project. Solutions are the publisher's, linked not copied.