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1.Any one of the arguments are non-numeric
1.Any one of the arguments are non-numeric
2.<math>alpha \le 0 </math> or <math>beta \le 0 </math>
2.<math>alpha \le 0 </math> or <math>beta \le 0 </math>
3.<math>prob < 0</math> or <math> prob > 1 </math>
3.<math>probability < 0</math> or <math> probability > 1 </math>
==Examples==
==Examples==