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Question

Two symmetrical dice are thrown The probability of getting a sum of 6 points is

  1. fraction numerator 4 over denominator 36 end fraction    
  2. fraction numerator 5 over denominator 36 end fraction    
  3. fraction numerator 6 over denominator 36 end fraction    
  4. fraction numerator 1 over denominator 36 end fraction    

The correct answer is: fraction numerator 5 over denominator 36 end fraction


    Required probability equals fraction numerator r minus 1 over denominator 6 to the power of 2 end exponent end fraction where r equals 6
    equals fraction numerator 6 minus 1 over denominator 6 to the power of 2 end exponent end fraction equals fraction numerator 5 over denominator 36 end fraction

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