The CAS Registry Mumber 320417-27-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 3,2,0,4,1 and 7 respectively; the second part has 2 digits, 2 and 7 respectively. Calculate Digit Verification of CAS Registry Number 320417-27: (8*3)+(7*2)+(6*0)+(5*4)+(4*1)+(3*7)+(2*2)+(1*7)=94 94 % 10 = 4 So 320417-27-4 is a valid CAS Registry Number.
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