The CAS Registry Mumber 77987-00-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,7,9,8 and 7 respectively; the second part has 2 digits, 0 and 0 respectively. Calculate Digit Verification of CAS Registry Number 77987-00: (7*7)+(6*7)+(5*9)+(4*8)+(3*7)+(2*0)+(1*0)=189 189 % 10 = 9 So 77987-00-9 is a valid CAS Registry Number.
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