The CAS Registry Mumber 17785-84-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,7,7,8 and 5 respectively; the second part has 2 digits, 8 and 4 respectively. Calculate Digit Verification of CAS Registry Number 17785-84: (7*1)+(6*7)+(5*7)+(4*8)+(3*5)+(2*8)+(1*4)=151 151 % 10 = 1 So 17785-84-1 is a valid CAS Registry Number.
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