The CAS Registry Mumber 71507-47-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,1,5,0 and 7 respectively; the second part has 2 digits, 4 and 7 respectively. Calculate Digit Verification of CAS Registry Number 71507-47: (7*7)+(6*1)+(5*5)+(4*0)+(3*7)+(2*4)+(1*7)=116 116 % 10 = 6 So 71507-47-6 is a valid CAS Registry Number.
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