The CAS Registry Mumber 131560-11-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,1,5,6 and 0 respectively; the second part has 2 digits, 1 and 1 respectively. Calculate Digit Verification of CAS Registry Number 131560-11: (8*1)+(7*3)+(6*1)+(5*5)+(4*6)+(3*0)+(2*1)+(1*1)=87 87 % 10 = 7 So 131560-11-7 is a valid CAS Registry Number.
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