The CAS Registry Mumber 77846-79-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,7,8,4 and 6 respectively; the second part has 2 digits, 7 and 9 respectively. Calculate Digit Verification of CAS Registry Number 77846-79: (7*7)+(6*7)+(5*8)+(4*4)+(3*6)+(2*7)+(1*9)=188 188 % 10 = 8 So 77846-79-8 is a valid CAS Registry Number.
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