The CAS Registry Mumber 730971-42-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 7,3,0,9,7 and 1 respectively; the second part has 2 digits, 4 and 2 respectively. Calculate Digit Verification of CAS Registry Number 730971-42: (8*7)+(7*3)+(6*0)+(5*9)+(4*7)+(3*1)+(2*4)+(1*2)=163 163 % 10 = 3 So 730971-42-3 is a valid CAS Registry Number.
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