The CAS Registry Mumber 157268-69-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,7,2,6 and 8 respectively; the second part has 2 digits, 6 and 9 respectively. Calculate Digit Verification of CAS Registry Number 157268-69: (8*1)+(7*5)+(6*7)+(5*2)+(4*6)+(3*8)+(2*6)+(1*9)=164 164 % 10 = 4 So 157268-69-4 is a valid CAS Registry Number.
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