The CAS Registry Mumber 308795-83-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 3,0,8,7,9 and 5 respectively; the second part has 2 digits, 8 and 3 respectively. Calculate Digit Verification of CAS Registry Number 308795-83: (8*3)+(7*0)+(6*8)+(5*7)+(4*9)+(3*5)+(2*8)+(1*3)=177 177 % 10 = 7 So 308795-83-7 is a valid CAS Registry Number.
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