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What is the time complexity of matrix multiplied recursively by Strassen’s Method?

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What is the time complexity of matrix multiplied recursively by Strassen’s Method?

(a) O(n^log7)

(b) O(n^2)

(c) O(n^3)

(d) O(n!)

This question was posed to me during an online exam.

This interesting question is from Recursion topic in division Recursion of Data Structures & Algorithms II

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The correct option is (a) O(n^log7)

The best I can explain: The time complexity of recursive multiplication of two square matrices by Strassen’s Method is found to be O(n^log7) since there are total 7 recursive calls.

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