The CAS Registry Mumber 159650-32-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,9,6,5 and 0 respectively; the second part has 2 digits, 3 and 2 respectively. Calculate Digit Verification of CAS Registry Number 159650-32: (8*1)+(7*5)+(6*9)+(5*6)+(4*5)+(3*0)+(2*3)+(1*2)=155 155 % 10 = 5 So 159650-32-5 is a valid CAS Registry Number.
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