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What is the time complexity of the fastest known matrix multiplication algorithm?

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What is the time complexity of the fastest known matrix multiplication algorithm?

(a) O(n^log7)

(b) O(n^2.37)

(c) O(n^3)

(d) O(n!)

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The correct choice is (b) O(n^2.37)

To explain: The Coppersmith-Winograd algorithm multiplies the matrices in O(n^2.37) time. Several improvements have been made in the algorithm since 2010.

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