The CAS Registry Mumber 63658-81-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,3,6,5 and 8 respectively; the second part has 2 digits, 8 and 1 respectively. Calculate Digit Verification of CAS Registry Number 63658-81: (7*6)+(6*3)+(5*6)+(4*5)+(3*8)+(2*8)+(1*1)=151 151 % 10 = 1 So 63658-81-1 is a valid CAS Registry Number.
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