The CAS Registry Mumber 1555-64-2 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,5,5 and 5 respectively; the second part has 2 digits, 6 and 4 respectively. Calculate Digit Verification of CAS Registry Number 1555-64: (6*1)+(5*5)+(4*5)+(3*5)+(2*6)+(1*4)=82 82 % 10 = 2 So 1555-64-2 is a valid CAS Registry Number.
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