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Problem 407

Algebra Difficulty 2.0 Prove it UKMT Senior Kangaroo · United Kingdom · 2019

When I noticed that 24=422^4 = 4^2, I tried to find other pairs of numbers with this property. Trying 2 and 16, I realised that 2162^{16} is larger than 16216^2. How many times larger is 2162^{16}?

This one wants a proof. Work it on paper, then check yourself against the publisher's own solution, linked below. Be honest about it: the record is only any use to you if it is.

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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.