The CAS Registry Mumber 103620-76-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,3,6,2 and 0 respectively; the second part has 2 digits, 7 and 6 respectively. Calculate Digit Verification of CAS Registry Number 103620-76: (8*1)+(7*0)+(6*3)+(5*6)+(4*2)+(3*0)+(2*7)+(1*6)=84 84 % 10 = 4 So 103620-76-4 is a valid CAS Registry Number.
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