---
title: "What is the proof for all n and a that an−1 = a multiple of (a−1) where a,n∈Z∗?"  
description: "What is the proof for all n and a that an−1 = a multiple of (a−1) where a,n∈Z∗?"  
author: "twinkle das"  
published: 2018-03-07  
canonical: https://answers.mindstick.com/qa/37281/what-is-the-proof-for-all-n-and-a-that-an-1-a-multiple-of-a-1-where-a-n-z  
category: "math"  
tags: ["applied math"]  
reading_time: 1 minute  

---

# What is the proof for all n and a that an−1 = a multiple of (a−1) where a,n∈Z∗?

What is the [proof](https://yourviews.mindstick.com/view/350/opposition-crying-for-proof-over-killing-terrorists) for all n and a that an-1 = a [multiple](https://www.mindstick.com/forum/2323/handling-multiple-submit-button-in-asp-dot-net-mvc) of (a-1) where a,n?Z*?


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Original Source: https://answers.mindstick.com/qa/37281/what-is-the-proof-for-all-n-and-a-that-an-1-a-multiple-of-a-1-where-a-n-z

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