Mathematics
21 Online
OpenStudy (anonymous):
Please help me ---- [1]
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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 ?
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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.
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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 ?
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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):
\[\dfrac{(24X+1)\cdot 5}{24}\]
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OpenStudy (anonymous):
GOT it X is any integer right
ganeshie8 (ganeshie8):
yes
OpenStudy (anonymous):
thank you
ganeshie8 (ganeshie8):
\[(24+1)^m = 24^m + 24^{m-1} + \cdots + 24^2+24+1 = 24X+1 \]