The CAS Registry Mumber 137936-75-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,7,9,3 and 6 respectively; the second part has 2 digits, 7 and 5 respectively. Calculate Digit Verification of CAS Registry Number 137936-75: (8*1)+(7*3)+(6*7)+(5*9)+(4*3)+(3*6)+(2*7)+(1*5)=165 165 % 10 = 5 So 137936-75-5 is a valid CAS Registry Number.
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