The CAS Registry Mumber 148217-21-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,8,2,1 and 7 respectively; the second part has 2 digits, 2 and 1 respectively. Calculate Digit Verification of CAS Registry Number 148217-21: (8*1)+(7*4)+(6*8)+(5*2)+(4*1)+(3*7)+(2*2)+(1*1)=124 124 % 10 = 4 So 148217-21-4 is a valid CAS Registry Number.
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