The CAS Registry Mumber 157846-84-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,7,8,4 and 6 respectively; the second part has 2 digits, 8 and 4 respectively. Calculate Digit Verification of CAS Registry Number 157846-84: (8*1)+(7*5)+(6*7)+(5*8)+(4*4)+(3*6)+(2*8)+(1*4)=179 179 % 10 = 9 So 157846-84-9 is a valid CAS Registry Number.
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