The CAS Registry Mumber 274915-15-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,7,4,9,1 and 5 respectively; the second part has 2 digits, 1 and 5 respectively. Calculate Digit Verification of CAS Registry Number 274915-15: (8*2)+(7*7)+(6*4)+(5*9)+(4*1)+(3*5)+(2*1)+(1*5)=160 160 % 10 = 0 So 274915-15-0 is a valid CAS Registry Number.
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