The CAS Registry Mumber 63978-98-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,3,9,7 and 8 respectively; the second part has 2 digits, 9 and 8 respectively. Calculate Digit Verification of CAS Registry Number 63978-98: (7*6)+(6*3)+(5*9)+(4*7)+(3*8)+(2*9)+(1*8)=183 183 % 10 = 3 So 63978-98-3 is a valid CAS Registry Number.
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