The CAS Registry Mumber 39178-87-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,9,1,7 and 8 respectively; the second part has 2 digits, 8 and 7 respectively. Calculate Digit Verification of CAS Registry Number 39178-87: (7*3)+(6*9)+(5*1)+(4*7)+(3*8)+(2*8)+(1*7)=155 155 % 10 = 5 So 39178-87-5 is a valid CAS Registry Number.
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