The CAS Registry Mumber 1338247-28-1 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,3,3,8,2,4 and 7 respectively; the second part has 2 digits, 2 and 8 respectively. Calculate Digit Verification of CAS Registry Number 1338247-28: (9*1)+(8*3)+(7*3)+(6*8)+(5*2)+(4*4)+(3*7)+(2*2)+(1*8)=161 161 % 10 = 1 So 1338247-28-1 is a valid CAS Registry Number.
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