The CAS Registry Mumber 9010-83-7 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 9,0,1 and 0 respectively; the second part has 2 digits, 8 and 3 respectively. Calculate Digit Verification of CAS Registry Number 9010-83: (6*9)+(5*0)+(4*1)+(3*0)+(2*8)+(1*3)=77 77 % 10 = 7 So 9010-83-7 is a valid CAS Registry Number.
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