I just need more of an in depth explanation with this answer please. I’m not fully understanding what the formula is that was written. The full question was “ One number will be selected at random one, two, three, four, and five. What is the probability that the number selected will be even?” I’m not sure what p(E) = n(E)/n(s) is supposed to mean. I appreciate the help! Thank you also will that always be the formula for a probability question like this

I just need more of an in depth explanation with this answer please. I’m not fully understanding what the formula is that was written. The full question was “ One number will be selected at random one, two, three, four, and five. What is the probability that the number selected will be even?” I’m not sure what p(E) = n(E)/n(s) is supposed to mean. I appreciate the help! Thank you also will that always be the formula for a probability question like this

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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just the last part, thank you!
Please answer only correct with explanation.