The CAS Registry Mumber 61568-71-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,1,5,6 and 8 respectively; the second part has 2 digits, 7 and 1 respectively. Calculate Digit Verification of CAS Registry Number 61568-71: (7*6)+(6*1)+(5*5)+(4*6)+(3*8)+(2*7)+(1*1)=136 136 % 10 = 6 So 61568-71-6 is a valid CAS Registry Number.
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