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Mathematics 21 Online
OpenStudy (anonymous):

Please help me ---- [1]

OpenStudy (anonymous):

OpenStudy (anonymous):

Not getting the sollution

ganeshie8 (ganeshie8):

Do you agree 5 can be represented as 2k+1 ?

OpenStudy (anonymous):

yes as it is odd

ganeshie8 (ganeshie8):

what about 5^5 ? is it still odd ?

OpenStudy (anonymous):

5^{2m+1}

OpenStudy (anonymous):

so, yeah odd

ganeshie8 (ganeshie8):

5*5*5*5*5*... = odd number yes ?

OpenStudy (anonymous):

yes

ganeshie8 (ganeshie8):

it doesn't matter how many times you multiply an odd prime, it always stays odd.

ganeshie8 (ganeshie8):

good thats the only thing you need to know

ganeshie8 (ganeshie8):

can we say \[5^{5^{5^{5^{\cdots}}}} = 5^{2m+1}\] for some integer \(m\)

OpenStudy (anonymous):

yes

ganeshie8 (ganeshie8):

good, so we reduced the problem to finding the remainder of a simple friendly number : \(5^{2m+1}\)

ganeshie8 (ganeshie8):

\[5^{2m+1} = 5^{2m}\cdot 5^1 = 25^m\cdot 5\] still yes ?

OpenStudy (anonymous):

25 = 5^2 5= 5^1 25^m .5 = 5^{2m+1} so yes

ganeshie8 (ganeshie8):

divide by 24 and use binomial theorem to find the remainder

ganeshie8 (ganeshie8):

\[\dfrac{25^m\cdot 5}{24}\]

ganeshie8 (ganeshie8):

\[\dfrac{(24+1)^m\cdot 5}{24}\]

ganeshie8 (ganeshie8):

\[\dfrac{(24X+1)\cdot 5}{24}\]

OpenStudy (anonymous):

GOT it X is any integer right

ganeshie8 (ganeshie8):

yes

OpenStudy (anonymous):

thank you

ganeshie8 (ganeshie8):

\[(24+1)^m = 24^m + 24^{m-1} + \cdots + 24^2+24+1 = 24X+1 \]

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