The CAS Registry Mumber 31677-97-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,1,6,7 and 7 respectively; the second part has 2 digits, 9 and 7 respectively. Calculate Digit Verification of CAS Registry Number 31677-97: (7*3)+(6*1)+(5*6)+(4*7)+(3*7)+(2*9)+(1*7)=131 131 % 10 = 1 So 31677-97-1 is a valid CAS Registry Number.
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