The CAS Registry Mumber 161970-74-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,6,1,9,7 and 0 respectively; the second part has 2 digits, 7 and 4 respectively. Calculate Digit Verification of CAS Registry Number 161970-74: (8*1)+(7*6)+(6*1)+(5*9)+(4*7)+(3*0)+(2*7)+(1*4)=147 147 % 10 = 7 So 161970-74-7 is a valid CAS Registry Number.
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