The CAS Registry Mumber 154842-10-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,4,8,4 and 2 respectively; the second part has 2 digits, 1 and 0 respectively. Calculate Digit Verification of CAS Registry Number 154842-10: (8*1)+(7*5)+(6*4)+(5*8)+(4*4)+(3*2)+(2*1)+(1*0)=131 131 % 10 = 1 So 154842-10-1 is a valid CAS Registry Number.
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