The CAS Registry Mumber 183238-51-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,3,2,3 and 8 respectively; the second part has 2 digits, 5 and 1 respectively. Calculate Digit Verification of CAS Registry Number 183238-51: (8*1)+(7*8)+(6*3)+(5*2)+(4*3)+(3*8)+(2*5)+(1*1)=139 139 % 10 = 9 So 183238-51-9 is a valid CAS Registry Number.
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