The CAS Registry Mumber 7716-13-4 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,7,1 and 6 respectively; the second part has 2 digits, 1 and 3 respectively. Calculate Digit Verification of CAS Registry Number 7716-13: (6*7)+(5*7)+(4*1)+(3*6)+(2*1)+(1*3)=104 104 % 10 = 4 So 7716-13-4 is a valid CAS Registry Number.
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