The CAS Registry Mumber 65910-38-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,5,9,1 and 0 respectively; the second part has 2 digits, 3 and 8 respectively. Calculate Digit Verification of CAS Registry Number 65910-38: (7*6)+(6*5)+(5*9)+(4*1)+(3*0)+(2*3)+(1*8)=135 135 % 10 = 5 So 65910-38-5 is a valid CAS Registry Number.
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