The CAS Registry Mumber 120657-76-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,0,6,5 and 7 respectively; the second part has 2 digits, 7 and 6 respectively. Calculate Digit Verification of CAS Registry Number 120657-76: (8*1)+(7*2)+(6*0)+(5*6)+(4*5)+(3*7)+(2*7)+(1*6)=113 113 % 10 = 3 So 120657-76-3 is a valid CAS Registry Number.
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