The CAS Registry Mumber 157380-65-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,7,3,8 and 0 respectively; the second part has 2 digits, 6 and 5 respectively. Calculate Digit Verification of CAS Registry Number 157380-65: (8*1)+(7*5)+(6*7)+(5*3)+(4*8)+(3*0)+(2*6)+(1*5)=149 149 % 10 = 9 So 157380-65-9 is a valid CAS Registry Number.
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