The CAS Registry Mumber 68957-27-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,8,9,5 and 7 respectively; the second part has 2 digits, 2 and 7 respectively. Calculate Digit Verification of CAS Registry Number 68957-27: (7*6)+(6*8)+(5*9)+(4*5)+(3*7)+(2*2)+(1*7)=187 187 % 10 = 7 So 68957-27-7 is a valid CAS Registry Number.
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