The CAS Registry Mumber 147235-17-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,7,2,3 and 5 respectively; the second part has 2 digits, 1 and 7 respectively. Calculate Digit Verification of CAS Registry Number 147235-17: (8*1)+(7*4)+(6*7)+(5*2)+(4*3)+(3*5)+(2*1)+(1*7)=124 124 % 10 = 4 So 147235-17-4 is a valid CAS Registry Number.
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