The CAS Registry Mumber 765251-99-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 7,6,5,2,5 and 1 respectively; the second part has 2 digits, 9 and 9 respectively. Calculate Digit Verification of CAS Registry Number 765251-99: (8*7)+(7*6)+(6*5)+(5*2)+(4*5)+(3*1)+(2*9)+(1*9)=188 188 % 10 = 8 So 765251-99-8 is a valid CAS Registry Number.
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