The CAS Registry Mumber 1025284-40-5 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,0,2,5,2,8 and 4 respectively; the second part has 2 digits, 4 and 0 respectively. Calculate Digit Verification of CAS Registry Number 1025284-40: (9*1)+(8*0)+(7*2)+(6*5)+(5*2)+(4*8)+(3*4)+(2*4)+(1*0)=115 115 % 10 = 5 So 1025284-40-5 is a valid CAS Registry Number.
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