The CAS Registry Mumber 137887-05-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,7,8,8 and 7 respectively; the second part has 2 digits, 0 and 5 respectively. Calculate Digit Verification of CAS Registry Number 137887-05: (8*1)+(7*3)+(6*7)+(5*8)+(4*8)+(3*7)+(2*0)+(1*5)=169 169 % 10 = 9 So 137887-05-9 is a valid CAS Registry Number.
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