The CAS Registry Mumber 27812-34-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,7,8,1 and 2 respectively; the second part has 2 digits, 3 and 4 respectively. Calculate Digit Verification of CAS Registry Number 27812-34: (7*2)+(6*7)+(5*8)+(4*1)+(3*2)+(2*3)+(1*4)=116 116 % 10 = 6 So 27812-34-6 is a valid CAS Registry Number.
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