The CAS Registry Mumber 183615-70-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,3,6,1 and 5 respectively; the second part has 2 digits, 7 and 0 respectively. Calculate Digit Verification of CAS Registry Number 183615-70: (8*1)+(7*8)+(6*3)+(5*6)+(4*1)+(3*5)+(2*7)+(1*0)=145 145 % 10 = 5 So 183615-70-5 is a valid CAS Registry Number.
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