How to run a Js function that is connected to a button more than once?

Question

Opa galera!

Next I have a function in the file "Script.js" which returns a message formatted with values obtained as follows::

Data manipulation:

let choice = ['a', 'b', 'c']
let resultado = []
resultado.push(choice[Math.floor((Math.random() * choice.length))])

Assignment of data output:

let div = document.getElementById("divId")

And finally the function that presents the manipulated data in a formatted way:

function Show() {
    let resultado = 'valor obtido = ' + resultado[0]
    div.InnerHTML = resultado
}

Until then ta show, I made a standard HTML document put the div and everything, I made a button and 'bindei' the function Show() in the onclick within the document Html, wonder worked but the button is clickable only once! Here comes my question, how do I press that the button again it presents a different result within the choices it has ('a', 'b', 'c')