The CAS Registry Mumber 187960-85-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,7,9,6 and 0 respectively; the second part has 2 digits, 8 and 5 respectively. Calculate Digit Verification of CAS Registry Number 187960-85: (8*1)+(7*8)+(6*7)+(5*9)+(4*6)+(3*0)+(2*8)+(1*5)=196 196 % 10 = 6 So 187960-85-6 is a valid CAS Registry Number.
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