The CAS Registry Mumber 38540-44-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,8,5,4 and 0 respectively; the second part has 2 digits, 4 and 4 respectively. Calculate Digit Verification of CAS Registry Number 38540-44: (7*3)+(6*8)+(5*5)+(4*4)+(3*0)+(2*4)+(1*4)=122 122 % 10 = 2 So 38540-44-2 is a valid CAS Registry Number.
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