The CAS Registry Mumber 19136-40-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,9,1,3 and 6 respectively; the second part has 2 digits, 4 and 0 respectively. Calculate Digit Verification of CAS Registry Number 19136-40: (7*1)+(6*9)+(5*1)+(4*3)+(3*6)+(2*4)+(1*0)=104 104 % 10 = 4 So 19136-40-4 is a valid CAS Registry Number.
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