The CAS Registry Mumber 197715-74-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,7,7,1 and 5 respectively; the second part has 2 digits, 7 and 4 respectively. Calculate Digit Verification of CAS Registry Number 197715-74: (8*1)+(7*9)+(6*7)+(5*7)+(4*1)+(3*5)+(2*7)+(1*4)=185 185 % 10 = 5 So 197715-74-5 is a valid CAS Registry Number.
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