The CAS Registry Mumber 100209-10-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,0,2,0 and 9 respectively; the second part has 2 digits, 1 and 0 respectively. Calculate Digit Verification of CAS Registry Number 100209-10: (8*1)+(7*0)+(6*0)+(5*2)+(4*0)+(3*9)+(2*1)+(1*0)=47 47 % 10 = 7 So 100209-10-7 is a valid CAS Registry Number.
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