The CAS Registry Mumber 3737-71-1 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 3,7,3 and 7 respectively; the second part has 2 digits, 7 and 1 respectively. Calculate Digit Verification of CAS Registry Number 3737-71: (6*3)+(5*7)+(4*3)+(3*7)+(2*7)+(1*1)=101 101 % 10 = 1 So 3737-71-1 is a valid CAS Registry Number.
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