The CAS Registry Mumber 134887-74-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,4,8,8 and 7 respectively; the second part has 2 digits, 7 and 4 respectively. Calculate Digit Verification of CAS Registry Number 134887-74: (8*1)+(7*3)+(6*4)+(5*8)+(4*8)+(3*7)+(2*7)+(1*4)=164 164 % 10 = 4 So 134887-74-4 is a valid CAS Registry Number.
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