The CAS Registry Mumber 1297613-70-7 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,2,9,7,6,1 and 3 respectively; the second part has 2 digits, 7 and 0 respectively. Calculate Digit Verification of CAS Registry Number 1297613-70: (9*1)+(8*2)+(7*9)+(6*7)+(5*6)+(4*1)+(3*3)+(2*7)+(1*0)=187 187 % 10 = 7 So 1297613-70-7 is a valid CAS Registry Number.
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