Library / /19 of 121

, 2015

Number theory Difficulty 1.0 Junior Find the answer United Kingdom

What is the units digit of the number $2015^2 + 2015^0 + 2015^1 + 2015^5$ ?

(A) $1$ (B) $5$ (C) $6$ (D) $7$ (E) $9$

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