The CAS Registry Mumber 65799-80-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,5,7,9 and 9 respectively; the second part has 2 digits, 8 and 0 respectively. Calculate Digit Verification of CAS Registry Number 65799-80: (7*6)+(6*5)+(5*7)+(4*9)+(3*9)+(2*8)+(1*0)=186 186 % 10 = 6 So 65799-80-6 is a valid CAS Registry Number.
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