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If ` vec a` and `vec b` are any two vectors of magnitudes 2 and 3, respectively, such that `|2( vec axx vec b)|+|3( vec a. vec b)|=k ,` then the maximum value of `k` is a.`sqrt(13)` b. `2sqrt(13)` c. `6sqrt(13)` d. `10sqrt(13)`

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