The CAS Registry Mumber 765249-50-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 7,6,5,2,4 and 9 respectively; the second part has 2 digits, 5 and 0 respectively. Calculate Digit Verification of CAS Registry Number 765249-50: (8*7)+(7*6)+(6*5)+(5*2)+(4*4)+(3*9)+(2*5)+(1*0)=191 191 % 10 = 1 So 765249-50-1 is a valid CAS Registry Number.
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