Track / Stage 2 / 94 of 320 #414 of 2604

Which of the following numbers is not the sum of two or more consecutive positive integers?

(A) $6$ (B) $7$ (C) $8$ (D) $9$ (E) $10$

The source for this one didn't record the answer, so there is nothing to check what you type against. Work it on paper and mark yourself against the solution below.

I solved it I didn't Skip

Next problem →

We don't reproduce this publisher's solutions. Their own solution is here — work the problem first.

Source: UK Mathematics Trust, licensed © UK Mathematics Trust; past papers published free at ukmt.org.uk. Statement reproduced verbatim; metadata (topic, difficulty, ordering) added by this project. Solutions are the publisher's, linked not copied.