The CAS Registry Mumber 672925-20-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,7,2,9,2 and 5 respectively; the second part has 2 digits, 2 and 0 respectively. Calculate Digit Verification of CAS Registry Number 672925-20: (8*6)+(7*7)+(6*2)+(5*9)+(4*2)+(3*5)+(2*2)+(1*0)=181 181 % 10 = 1 So 672925-20-1 is a valid CAS Registry Number.
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