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Let A1, A2, A3, and A4 be four matrices of dimensions 10 x 5, 5 x 20, 20 x 10, and 10 x 5, respectively. The minimum number of scalar multiplications required to find the product A1 A2 AA4 using the basic matrix multiplication method is ______.

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Correct answer is 1500

No. of ways of multiplying the chain of matrices = 2m Cm/m+1

Where m= no. of multiplications (not matrices)

6C3/3+1 = 5

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