The CAS Registry Mumber 219846-31-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,1,9,8,4 and 6 respectively; the second part has 2 digits, 3 and 1 respectively. Calculate Digit Verification of CAS Registry Number 219846-31: (8*2)+(7*1)+(6*9)+(5*8)+(4*4)+(3*6)+(2*3)+(1*1)=158 158 % 10 = 8 So 219846-31-8 is a valid CAS Registry Number.
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