The CAS Registry Mumber 1215831-40-5 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,2,1,5,8,3 and 1 respectively; the second part has 2 digits, 4 and 0 respectively. Calculate Digit Verification of CAS Registry Number 1215831-40: (9*1)+(8*2)+(7*1)+(6*5)+(5*8)+(4*3)+(3*1)+(2*4)+(1*0)=125 125 % 10 = 5 So 1215831-40-5 is a valid CAS Registry Number.
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