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If A B=A ,B A=B then (A+B)^n= (where n i...

If `A B=A ,B A=B` then `(A+B)^n=` (where `n in N)` (1)`(A^2+B^2)` (2) `(A+B)` (3) `2^(n-1)(A+B)` (4) `2^n(A+B)`

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