The CAS Registry Mumber 65556-93-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,5,5,5 and 6 respectively; the second part has 2 digits, 9 and 3 respectively. Calculate Digit Verification of CAS Registry Number 65556-93: (7*6)+(6*5)+(5*5)+(4*5)+(3*6)+(2*9)+(1*3)=156 156 % 10 = 6 So 65556-93-6 is a valid CAS Registry Number.
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