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Sum multiples of 3 and 5: Difference between revisions
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2333333333333333333316666666666666666668</pre>
=={{header|C sharp|C#}}==
The following C# 5 / .Net 4 code is an <i>efficient solution</i> in that it does not iterate through the numbers 1 ... n - 1 in order to calculate the answer. On the other hand, the System.Numerics.BigInteger class (.Net 4 and upwards) is not itself efficient because calculations take place in software instead of hardware. Consequently, it may be <i>faster</i> to conduct the calculation for smaller values with native ("primitive") types using a 'brute force' iteration approach.
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