The CAS Registry Mumber 167425-72-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,6,7,4,2 and 5 respectively; the second part has 2 digits, 7 and 2 respectively. Calculate Digit Verification of CAS Registry Number 167425-72: (8*1)+(7*6)+(6*7)+(5*4)+(4*2)+(3*5)+(2*7)+(1*2)=151 151 % 10 = 1 So 167425-72-1 is a valid CAS Registry Number.
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