The CAS Registry Mumber 100678-75-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,0,6,7 and 8 respectively; the second part has 2 digits, 7 and 5 respectively. Calculate Digit Verification of CAS Registry Number 100678-75: (8*1)+(7*0)+(6*0)+(5*6)+(4*7)+(3*8)+(2*7)+(1*5)=109 109 % 10 = 9 So 100678-75-9 is a valid CAS Registry Number.
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