The CAS Registry Mumber 31908-53-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,1,9,0 and 8 respectively; the second part has 2 digits, 5 and 3 respectively. Calculate Digit Verification of CAS Registry Number 31908-53: (7*3)+(6*1)+(5*9)+(4*0)+(3*8)+(2*5)+(1*3)=109 109 % 10 = 9 So 31908-53-9 is a valid CAS Registry Number.
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