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These are questions asked by yangtheary

If (abc‾) and (abcabcabc...abc‾)Ξ0(mod91).Find all non-negative integers (a,b,c)?

Let a sequence( an  ) defined by an=1,3,6,12,33,51,...and n=1,2,3,.... Find formula an?

If log105 =c and log2050=d express log940 in terms of c and d ?

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