The CAS Registry Mumber 337920-10-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 3,3,7,9,2 and 0 respectively; the second part has 2 digits, 1 and 0 respectively. Calculate Digit Verification of CAS Registry Number 337920-10: (8*3)+(7*3)+(6*7)+(5*9)+(4*2)+(3*0)+(2*1)+(1*0)=142 142 % 10 = 2 So 337920-10-2 is a valid CAS Registry Number.
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