The CAS Registry Mumber 65955-42-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,5,9,5 and 5 respectively; the second part has 2 digits, 4 and 2 respectively. Calculate Digit Verification of CAS Registry Number 65955-42: (7*6)+(6*5)+(5*9)+(4*5)+(3*5)+(2*4)+(1*2)=162 162 % 10 = 2 So 65955-42-2 is a valid CAS Registry Number.
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