The CAS Registry Mumber 15957-34-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,5,9,5 and 7 respectively; the second part has 2 digits, 3 and 4 respectively. Calculate Digit Verification of CAS Registry Number 15957-34: (7*1)+(6*5)+(5*9)+(4*5)+(3*7)+(2*3)+(1*4)=133 133 % 10 = 3 So 15957-34-3 is a valid CAS Registry Number.
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