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Problem 39

Combinatorics Difficulty 1.1 Multiple choice CEMC Gauss (Grade 8) · Canada · 2017

A pentagon is divided into 5 equal sections, as shown.

An arrow is attached to the centre of the pentagon. The arrow is spun once. What is the probability that the arrow stops in the section numbered 4?

Pick one

Official solution

Michael has $280 in$ 20 bills and so the number of $20 bills that he has is$ $280\div20=14\$.$

Source: CEMC, University of Waterloo, licensed CC-BY-NC-4.0. Statement reproduced verbatim; metadata (topic, difficulty, ordering) added by this project.