The CAS Registry Mumber 83855-49-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,3,8,5 and 5 respectively; the second part has 2 digits, 4 and 9 respectively. Calculate Digit Verification of CAS Registry Number 83855-49: (7*8)+(6*3)+(5*8)+(4*5)+(3*5)+(2*4)+(1*9)=166 166 % 10 = 6 So 83855-49-6 is a valid CAS Registry Number.
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