The CAS Registry Mumber 438220-65-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,3,8,2,2 and 0 respectively; the second part has 2 digits, 6 and 5 respectively. Calculate Digit Verification of CAS Registry Number 438220-65: (8*4)+(7*3)+(6*8)+(5*2)+(4*2)+(3*0)+(2*6)+(1*5)=136 136 % 10 = 6 So 438220-65-6 is a valid CAS Registry Number.
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