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Is 70/7^n an integer?

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Math Expert
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Joined: 02 Aug 2009
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Is 70/7^n an integer?  [#permalink]

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New post 03 May 2016, 04:48
2
1
00:00
A
B
C
D
E

Difficulty:

  55% (hard)

Question Stats:

65% (01:00) correct 35% (01:02) wrong based on 61 sessions

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Is \(\frac{70}{7^n}\) an integer, if n is an integer?
(1) n is a positive integer.
(2) n<2

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Re: Is 70/7^n an integer?  [#permalink]

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New post 03 May 2016, 06:24
1
St1: n = 1, 2,....
70/7 --> integer
70/7^2 --> not an integer
Not Sufficient

St2: n = 1, 0, -1, -2, ....
When n is 0 or 1, 70/7^n is an integer
When n is negative, 70/7^-n = 70*7^n is an integer
Sufficient

Answer: B
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Re: Is 70/7^n an integer?  [#permalink]

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New post 24 Aug 2017, 07:22
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Re: Is 70/7^n an integer?   [#permalink] 24 Aug 2017, 07:22
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