The CAS Registry Mumber 27102-65-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,7,1,0 and 2 respectively; the second part has 2 digits, 6 and 5 respectively. Calculate Digit Verification of CAS Registry Number 27102-65: (7*2)+(6*7)+(5*1)+(4*0)+(3*2)+(2*6)+(1*5)=84 84 % 10 = 4 So 27102-65-4 is a valid CAS Registry Number.
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