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using matrix it can be solved but requires lot of time any other method to compute these type of problems???

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try to figure out in beginning which is giving less multiplications here...in ABC case if you multiply AB first your no. of multiplications would be 108 but if you multiply BC first no. of multiplications would be 9*4*2=72 which is lesss so you should first multiply  (BC) than (A(BC))

similarly you can try for next one.!

Order for second will be (((AB)C)D)

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