The CAS Registry Mumber 770685-87-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 7,7,0,6,8 and 5 respectively; the second part has 2 digits, 8 and 7 respectively. Calculate Digit Verification of CAS Registry Number 770685-87: (8*7)+(7*7)+(6*0)+(5*6)+(4*8)+(3*5)+(2*8)+(1*7)=205 205 % 10 = 5 So 770685-87-5 is a valid CAS Registry Number.
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