The CAS Registry Mumber 244056-56-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,4,4,0,5 and 6 respectively; the second part has 2 digits, 5 and 6 respectively. Calculate Digit Verification of CAS Registry Number 244056-56: (8*2)+(7*4)+(6*4)+(5*0)+(4*5)+(3*6)+(2*5)+(1*6)=122 122 % 10 = 2 So 244056-56-2 is a valid CAS Registry Number.
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