The CAS Registry Mumber 1603967-84-5 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,6,0,3,9,6 and 7 respectively; the second part has 2 digits, 8 and 4 respectively. Calculate Digit Verification of CAS Registry Number 1603967-84: (9*1)+(8*6)+(7*0)+(6*3)+(5*9)+(4*6)+(3*7)+(2*8)+(1*4)=185 185 % 10 = 5 So 1603967-84-5 is a valid CAS Registry Number.
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