= Let An= a₁ + a2 + ... + an, Bn=b₁ + b₂ + b3 + +bmDn C + C₂+...+c, and cn=a1bn + a₂bn-1+...+ab₁ne N. Using Cn mathematical induction, prove that ... = (a) DnaBn+ a₂Bn-1 +.... + a,B₁=b₁An + b₂A-1 + +bA₁ VEN (b) D₁ + D₂+...+D=A₁Bn+A₂B-1 + ... + AB₁ VnE N

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