The CAS Registry Mumber 188744-99-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,8,7,4 and 4 respectively; the second part has 2 digits, 9 and 9 respectively. Calculate Digit Verification of CAS Registry Number 188744-99: (8*1)+(7*8)+(6*8)+(5*7)+(4*4)+(3*4)+(2*9)+(1*9)=202 202 % 10 = 2 So 188744-99-2 is a valid CAS Registry Number.
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