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When [k^n-1]/[k-1]=k^n-1+k^n-2+.....+k+1,

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When [k^n-1]/[k-1]=k^n-1+k^n-2+.....+k+1,  [#permalink]

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New post Updated on: 19 Nov 2019, 22:47
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When [k^(n-1)]/[k-1]=k^(n-1)+k^(n-2)+.....+k+1, 7^8+7^7+.....+1= 6,725,601, what is the value of 7^9?

A. 6*6,725,601 + 1 B. 6*6,725,601 -1 C. 5*6,725,601 +1 D. 5*6,725,601 -1 E. 7*6,725,601+1


Hello all!
There is this sequence problem I can't figure out a solution to.
Can someone share any easy way to solve it?
Thanks! :please

Originally posted by ec9rs on 19 Nov 2019, 18:36.
Last edited by ec9rs on 19 Nov 2019, 22:47, edited 2 times in total.
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Re: When [k^n-1]/[k-1]=k^n-1+k^n-2+.....+k+1,  [#permalink]

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New post 19 Nov 2019, 20:23
ec9rs wrote:
When [k^n-1]/[k-1]=k^n-1+k^n-2+.....+k+1, 7^8+7^7+.....+1= 6,725,601, what is the value of 7^9?

A. 6*6,725,601 + 1 B. 6*6,725,601 -1 C. 5*6,725,601 +1 D. 5*6,725,601 -1 E. 7*6,725,601+1


Hello all!
There is this sequence problem I can't figure out a solution to.
Can someone share any easy way to solve it?
Thanks! :please



The question has asked o be posted clearly and formatted too.
It is not clear whether \(k^{n-1}/(k-1)\) or \(k^n-1/(k-1)\)
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Re: When [k^n-1]/[k-1]=k^n-1+k^n-2+.....+k+1,  [#permalink]

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New post 19 Nov 2019, 20:50
chetan2u wrote:
ec9rs wrote:
When [k^n-1]/[k-1]=k^n-1+k^n-2+.....+k+1, 7^8+7^7+.....+1= 6,725,601, what is the value of 7^9?

A. 6*6,725,601 + 1 B. 6*6,725,601 -1 C. 5*6,725,601 +1 D. 5*6,725,601 -1 E. 7*6,725,601+1


Hello all!
There is this sequence problem I can't figure out a solution to.
Can someone share any easy way to solve it?
Thanks! :please



The question has asked o be posted clearly and formatted too.
It is not clear whether \(k^{n-1}/(k-1)\) or \(k^n-1/(k-1)\)


Hi! Sorry for the confusion!
I edited the original post and it is supposed to be \(k^{n-1}/(k-1)\) .
Thanks!
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Re: When [k^n-1]/[k-1]=k^n-1+k^n-2+.....+k+1,  [#permalink]

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New post 19 Nov 2019, 22:58
ec9rs wrote:
When [k^(n-1)]/[k-1]=k^(n-1)+k^(n-2)+.....+k+1, 7^8+7^7+.....+1= 6,725,601, what is the value of 7^9?

A. 6*6,725,601 + 1 B. 6*6,725,601 -1 C. 5*6,725,601 +1 D. 5*6,725,601 -1 E. 7*6,725,601+1


Hello all!
There is this sequence problem I can't figure out a solution to.
Can someone share any easy way to solve it?
Thanks! :please


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Re: When [k^n-1]/[k-1]=k^n-1+k^n-2+.....+k+1,   [#permalink] 19 Nov 2019, 22:58
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