The CAS Registry Mumber 893747-42-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,9,3,7,4 and 7 respectively; the second part has 2 digits, 4 and 2 respectively. Calculate Digit Verification of CAS Registry Number 893747-42: (8*8)+(7*9)+(6*3)+(5*7)+(4*4)+(3*7)+(2*4)+(1*2)=227 227 % 10 = 7 So 893747-42-7 is a valid CAS Registry Number.
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