The CAS Registry Mumber 79801-50-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,9,8,0 and 1 respectively; the second part has 2 digits, 5 and 0 respectively. Calculate Digit Verification of CAS Registry Number 79801-50: (7*7)+(6*9)+(5*8)+(4*0)+(3*1)+(2*5)+(1*0)=156 156 % 10 = 6 So 79801-50-6 is a valid CAS Registry Number.
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