The CAS Registry Mumber 77058-75-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,7,0,5 and 8 respectively; the second part has 2 digits, 7 and 5 respectively. Calculate Digit Verification of CAS Registry Number 77058-75: (7*7)+(6*7)+(5*0)+(4*5)+(3*8)+(2*7)+(1*5)=154 154 % 10 = 4 So 77058-75-4 is a valid CAS Registry Number.
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