The CAS Registry Mumber 64771-75-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,4,7,7 and 1 respectively; the second part has 2 digits, 7 and 5 respectively. Calculate Digit Verification of CAS Registry Number 64771-75: (7*6)+(6*4)+(5*7)+(4*7)+(3*1)+(2*7)+(1*5)=151 151 % 10 = 1 So 64771-75-1 is a valid CAS Registry Number.
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