The CAS Registry Mumber 116500-77-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,6,5,0 and 0 respectively; the second part has 2 digits, 7 and 7 respectively. Calculate Digit Verification of CAS Registry Number 116500-77: (8*1)+(7*1)+(6*6)+(5*5)+(4*0)+(3*0)+(2*7)+(1*7)=97 97 % 10 = 7 So 116500-77-7 is a valid CAS Registry Number.
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