The CAS Registry Mumber 19865-91-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,9,8,6 and 5 respectively; the second part has 2 digits, 9 and 1 respectively. Calculate Digit Verification of CAS Registry Number 19865-91: (7*1)+(6*9)+(5*8)+(4*6)+(3*5)+(2*9)+(1*1)=159 159 % 10 = 9 So 19865-91-9 is a valid CAS Registry Number.
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