The CAS Registry Mumber 31302-92-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,1,3,0 and 2 respectively; the second part has 2 digits, 9 and 2 respectively. Calculate Digit Verification of CAS Registry Number 31302-92: (7*3)+(6*1)+(5*3)+(4*0)+(3*2)+(2*9)+(1*2)=68 68 % 10 = 8 So 31302-92-8 is a valid CAS Registry Number.
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