The CAS Registry Mumber 845780-97-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,4,5,7,8 and 0 respectively; the second part has 2 digits, 9 and 7 respectively. Calculate Digit Verification of CAS Registry Number 845780-97: (8*8)+(7*4)+(6*5)+(5*7)+(4*8)+(3*0)+(2*9)+(1*7)=214 214 % 10 = 4 So 845780-97-4 is a valid CAS Registry Number.
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