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n is a positive integer.

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n is a positive integer. [#permalink] New post   19 Jul 2024, 01:08
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n is a positive integer.

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Quantity B
The remainder when 5∗10n+1 is divided by 3
The remainder when 5∗10n+1+1 is divided by 3



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Re: n is a positive integer. [#permalink] New post   22 Sep 2024, 17:19
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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
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Re: n is a positive integer. [#permalink]
22 Sep 2024, 17:19
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