If you know that 21 cumulative multiplications can multiply two 3×3 matrices, how many multiplications are required to multiply two n×n matrices…
If you know that 21 cumulative multiplications can multiply two 3×3 matrices, how many multiplications are required to multiply two n×n matrices, where n is an integral power of 3?
From the BUET MSC (CSE) October 2017 – Written exam, question 3 of 20.