The CAS Registry Mumber 918-42-3 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 9,1 and 8 respectively; the second part has 2 digits, 4 and 2 respectively. Calculate Digit Verification of CAS Registry Number 918-42: (5*9)+(4*1)+(3*8)+(2*4)+(1*2)=83 83 % 10 = 3 So 918-42-3 is a valid CAS Registry Number.
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