The CAS Registry Mumber 169381-50-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,6,9,3,8 and 1 respectively; the second part has 2 digits, 5 and 0 respectively. Calculate Digit Verification of CAS Registry Number 169381-50: (8*1)+(7*6)+(6*9)+(5*3)+(4*8)+(3*1)+(2*5)+(1*0)=164 164 % 10 = 4 So 169381-50-4 is a valid CAS Registry Number.
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