The CAS Registry Mumber 620945-75-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,2,0,9,4 and 5 respectively; the second part has 2 digits, 7 and 5 respectively. Calculate Digit Verification of CAS Registry Number 620945-75: (8*6)+(7*2)+(6*0)+(5*9)+(4*4)+(3*5)+(2*7)+(1*5)=157 157 % 10 = 7 So 620945-75-7 is a valid CAS Registry Number.
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