The first term in a sequence is x. Each of the following terms is obtained by doubling the previous term and then adding 4. If the third term is 52, then x equals
(A) 7 (B) 8 (C) 9 (D) 10 (E) 11
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.