The CAS Registry Mumber 217792-90-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,1,7,7,9 and 2 respectively; the second part has 2 digits, 9 and 0 respectively. Calculate Digit Verification of CAS Registry Number 217792-90: (8*2)+(7*1)+(6*7)+(5*7)+(4*9)+(3*2)+(2*9)+(1*0)=160 160 % 10 = 0 So 217792-90-0 is a valid CAS Registry Number.
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