The CAS Registry Mumber 153079-21-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,3,0,7 and 9 respectively; the second part has 2 digits, 2 and 1 respectively. Calculate Digit Verification of CAS Registry Number 153079-21: (8*1)+(7*5)+(6*3)+(5*0)+(4*7)+(3*9)+(2*2)+(1*1)=121 121 % 10 = 1 So 153079-21-1 is a valid CAS Registry Number.
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