The CAS Registry Mumber 577988-71-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 5,7,7,9,8 and 8 respectively; the second part has 2 digits, 7 and 1 respectively. Calculate Digit Verification of CAS Registry Number 577988-71: (8*5)+(7*7)+(6*7)+(5*9)+(4*8)+(3*8)+(2*7)+(1*1)=247 247 % 10 = 7 So 577988-71-7 is a valid CAS Registry Number.
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