The CAS Registry Mumber 68911-55-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,8,9,1 and 1 respectively; the second part has 2 digits, 5 and 5 respectively. Calculate Digit Verification of CAS Registry Number 68911-55: (7*6)+(6*8)+(5*9)+(4*1)+(3*1)+(2*5)+(1*5)=157 157 % 10 = 7 So 68911-55-7 is a valid CAS Registry Number.
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