The CAS Registry Mumber 1234562-12-9 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,2,3,4,5,6 and 2 respectively; the second part has 2 digits, 1 and 2 respectively. Calculate Digit Verification of CAS Registry Number 1234562-12: (9*1)+(8*2)+(7*3)+(6*4)+(5*5)+(4*6)+(3*2)+(2*1)+(1*2)=129 129 % 10 = 9 So 1234562-12-9 is a valid CAS Registry Number.
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