The CAS Registry Mumber 136693-20-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,6,6,9 and 3 respectively; the second part has 2 digits, 2 and 0 respectively. Calculate Digit Verification of CAS Registry Number 136693-20: (8*1)+(7*3)+(6*6)+(5*6)+(4*9)+(3*3)+(2*2)+(1*0)=144 144 % 10 = 4 So 136693-20-4 is a valid CAS Registry Number.
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