The CAS Registry Mumber 157479-51-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,7,4,7 and 9 respectively; the second part has 2 digits, 5 and 1 respectively. Calculate Digit Verification of CAS Registry Number 157479-51: (8*1)+(7*5)+(6*7)+(5*4)+(4*7)+(3*9)+(2*5)+(1*1)=171 171 % 10 = 1 So 157479-51-1 is a valid CAS Registry Number.
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