The CAS Registry Mumber 784157-67-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 7,8,4,1,5 and 7 respectively; the second part has 2 digits, 6 and 7 respectively. Calculate Digit Verification of CAS Registry Number 784157-67: (8*7)+(7*8)+(6*4)+(5*1)+(4*5)+(3*7)+(2*6)+(1*7)=201 201 % 10 = 1 So 784157-67-1 is a valid CAS Registry Number.
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