The CAS Registry Mumber 1216654-38-4 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,2,1,6,6,5 and 4 respectively; the second part has 2 digits, 3 and 8 respectively. Calculate Digit Verification of CAS Registry Number 1216654-38: (9*1)+(8*2)+(7*1)+(6*6)+(5*6)+(4*5)+(3*4)+(2*3)+(1*8)=144 144 % 10 = 4 So 1216654-38-4 is a valid CAS Registry Number.
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