The CAS Registry Mumber 9008-61-1 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 9,0,0 and 8 respectively; the second part has 2 digits, 6 and 1 respectively. Calculate Digit Verification of CAS Registry Number 9008-61: (6*9)+(5*0)+(4*0)+(3*8)+(2*6)+(1*1)=91 91 % 10 = 1 So 9008-61-1 is a valid CAS Registry Number.
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