The CAS Registry Mumber 91307-69-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,1,3,0 and 7 respectively; the second part has 2 digits, 6 and 9 respectively. Calculate Digit Verification of CAS Registry Number 91307-69: (7*9)+(6*1)+(5*3)+(4*0)+(3*7)+(2*6)+(1*9)=126 126 % 10 = 6 So 91307-69-6 is a valid CAS Registry Number.
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