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n is a positive integer.
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19 Jul 2024, 01:08
19 Jul 2024, 01:08
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78% (01:13) correct
21% (01:25) wrong based on 32 sessions
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n is a positive integer.
Quantity A |
Quantity B |
The remainder when \(5*10^n +1\) is divided by 3 |
The remainder when \(5*10^{n+1} +1\) is divided by 3 |
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Re: n is a positive integer.
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22 Sep 2024, 17:19
22 Sep 2024, 17:19
2
Try a couple of numbers:
n = 1, A = 51
n = 2, A = 501
n = 3, A = 5001
So the pattern is 5-0(s)-1, this number is always divisible by 3 because sum of digits is 6, which is divisible by 3 => A = 0
B also has the same pattern and is always divisible by 3, B = 0
=> C
n = 1, A = 51
n = 2, A = 501
n = 3, A = 5001
So the pattern is 5-0(s)-1, this number is always divisible by 3 because sum of digits is 6, which is divisible by 3 => A = 0
B also has the same pattern and is always divisible by 3, B = 0
=> C
gmatclubot
Re: n is a positive integer. [#permalink]
22 Sep 2024, 17:19
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