The CAS Registry Mumber 67762-21-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,7,7,6 and 2 respectively; the second part has 2 digits, 2 and 1 respectively. Calculate Digit Verification of CAS Registry Number 67762-21: (7*6)+(6*7)+(5*7)+(4*6)+(3*2)+(2*2)+(1*1)=154 154 % 10 = 4 So 67762-21-4 is a valid CAS Registry Number.
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