The CAS Registry Mumber 915921-91-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 9,1,5,9,2 and 1 respectively; the second part has 2 digits, 9 and 1 respectively. Calculate Digit Verification of CAS Registry Number 915921-91: (8*9)+(7*1)+(6*5)+(5*9)+(4*2)+(3*1)+(2*9)+(1*1)=184 184 % 10 = 4 So 915921-91-4 is a valid CAS Registry Number.
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