The CAS Registry Mumber 1609561-13-8 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,6,0,9,5,6 and 1 respectively; the second part has 2 digits, 1 and 3 respectively. Calculate Digit Verification of CAS Registry Number 1609561-13: (9*1)+(8*6)+(7*0)+(6*9)+(5*5)+(4*6)+(3*1)+(2*1)+(1*3)=168 168 % 10 = 8 So 1609561-13-8 is a valid CAS Registry Number.
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