The CAS Registry Mumber 31848-84-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,1,8,4 and 8 respectively; the second part has 2 digits, 8 and 4 respectively. Calculate Digit Verification of CAS Registry Number 31848-84: (7*3)+(6*1)+(5*8)+(4*4)+(3*8)+(2*8)+(1*4)=127 127 % 10 = 7 So 31848-84-7 is a valid CAS Registry Number.
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