The CAS Registry Mumber 536742-34-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 5,3,6,7,4 and 2 respectively; the second part has 2 digits, 3 and 4 respectively. Calculate Digit Verification of CAS Registry Number 536742-34: (8*5)+(7*3)+(6*6)+(5*7)+(4*4)+(3*2)+(2*3)+(1*4)=164 164 % 10 = 4 So 536742-34-4 is a valid CAS Registry Number.
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