The CAS Registry Mumber 536742-35-5 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 5 respectively. Calculate Digit Verification of CAS Registry Number 536742-35: (8*5)+(7*3)+(6*6)+(5*7)+(4*4)+(3*2)+(2*3)+(1*5)=165 165 % 10 = 5 So 536742-35-5 is a valid CAS Registry Number.
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