The CAS Registry Mumber 72150-20-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,2,1,5 and 0 respectively; the second part has 2 digits, 2 and 0 respectively. Calculate Digit Verification of CAS Registry Number 72150-20: (7*7)+(6*2)+(5*1)+(4*5)+(3*0)+(2*2)+(1*0)=90 90 % 10 = 0 So 72150-20-0 is a valid CAS Registry Number.
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