List and discuss two major sources of errors in numerical methods

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There are three major sources of errors in numerical method, namely human error, truncation error and round off error, but here we have to discuss only two sources-

Human error: This type of error occurs when the experiment is being performed but student isn't attentive during the experiment, or noted down the wrong observation, this error is very difficult to detect. There are rules for significant figures and rounding off, but if we round off the values incorrectly it will lead to error in final answer.