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5. Show that $\phi(n^2) = n\phi(n)$ for all positive integers $n$. [Hint: Show it for $n = 1$ and also for $n = p^a$, where $p$ is prime.]

          5. Show that $\phi(n^2) = n\phi(n)$ for all positive integers $n$. [Hint: Show it for $n = 1$ and also for $n = p^a$, where $p$ is prime.]
        
5. Show that ϕ(n^2) = nϕ(n) for all positive integers n. [Hint: Show it for n = 1 and also for n = p^a, where p is prime.]

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Elementary and Intermediate Algebra
Elementary and Intermediate Algebra
Alan S. Tussy, R. David Gustafson 5th Edition
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5. Show that (n2) = no(n) for all positive integers n.[Hint: Show it for n = 1 and also for n = p", where p is prime.
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Transcript

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00:01 Hello, let's have a look at the question.
00:02 So here it is given for n is greater than equals to 2, n divides n minus 1 factorial plus 1.
00:15 That means n divides n minus 1 factorial plus 1.
00:21 Now let us take this as first equation.
00:25 Now we have to prove n is prime.
00:30 So we will prove this by contradiction.
00:41 Suppose n is not a prime number.
00:55 So now let us take that let n is equals to a into b for some a belongs to value 1 to n and b and b also lies from 1 to n.
01:17 To 2 to n minus 1 that is 1 is less than a and which is less than n.
01:29 So here we can say that a divides the product of this series that is n minus 1 factorial.
01:38 So let us take this as second equation.
01:41 Now we also know that n is equals to a into b.
01:46 So here we can say that a divides ab, that is here we can write a divides n...
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