The CAS Registry Mumber 957042-53-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 9,5,7,0,4 and 2 respectively; the second part has 2 digits, 5 and 3 respectively. Calculate Digit Verification of CAS Registry Number 957042-53: (8*9)+(7*5)+(6*7)+(5*0)+(4*4)+(3*2)+(2*5)+(1*3)=184 184 % 10 = 4 So 957042-53-4 is a valid CAS Registry Number.
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