[Solved] How to print numbers in the following pattern with .NET

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The problem is in the MakeALine method. You actually concat the number with itself, so for input 1 you actually get "1" + "1".

Instead you should repeat the string representation of your number k times. For this you can use Enumerable.Repeat in the following way:

static string MakeALine(int k)
{
    return String.Concat(Enumerable.Repeat(k.ToString(),k));
}

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solved How to print numbers in the following pattern with .NET