The CAS Registry Mumber 79820-76-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,9,8,2 and 0 respectively; the second part has 2 digits, 7 and 6 respectively. Calculate Digit Verification of CAS Registry Number 79820-76: (7*7)+(6*9)+(5*8)+(4*2)+(3*0)+(2*7)+(1*6)=171 171 % 10 = 1 So 79820-76-1 is a valid CAS Registry Number.
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