Logic: inductive force

or that with C as a premise. The degree to which this is so, however, cannot be estimated without looking at the facts of the particular case. For example, we might know that the murderer is a man from Harrogate, is left-handed and walks with a limp. Obviously a Harrogate man's being left-handed would not be strong evidence against him, and nor would his walking with a limp. His being both left-handed and walking with a limp would be stronger evidence against him, but to what degree? It depends on how many left-handed men there are in Harrogate who walk with a limp. If there happened to be exactly one, the evidence would be conclusive (the argument would be deductively valid). If there were more, then the evidence would be much weaker.

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