The CAS Registry Mumber 101978-09-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,1,9,7 and 8 respectively; the second part has 2 digits, 0 and 9 respectively. Calculate Digit Verification of CAS Registry Number 101978-09: (8*1)+(7*0)+(6*1)+(5*9)+(4*7)+(3*8)+(2*0)+(1*9)=120 120 % 10 = 0 So 101978-09-0 is a valid CAS Registry Number.
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