The CAS Registry Mumber 126731-59-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,6,7,3 and 1 respectively; the second part has 2 digits, 5 and 9 respectively. Calculate Digit Verification of CAS Registry Number 126731-59: (8*1)+(7*2)+(6*6)+(5*7)+(4*3)+(3*1)+(2*5)+(1*9)=127 127 % 10 = 7 So 126731-59-7 is a valid CAS Registry Number.
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