The missing number in the geometric sequence 2,6,18,54,____,486 is
(A) 72 (B) 90 (C) 108 (D) 162 (E) 216
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.