The CAS Registry Mumber 70509-83-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,0,5,0 and 9 respectively; the second part has 2 digits, 8 and 3 respectively. Calculate Digit Verification of CAS Registry Number 70509-83: (7*7)+(6*0)+(5*5)+(4*0)+(3*9)+(2*8)+(1*3)=120 120 % 10 = 0 So 70509-83-0 is a valid CAS Registry Number.
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