How did he deduce the dimensionality?

#1

At 23:50 in the video , I don’t get the logic behind deriving the dimensionality of the array. How did you deduce arr[x] * arr[k+1] * arr[y]

#2

arr[x] * arr[k+1] * arr[y+1]

#3

@sushant19_99,
Its just basic maths, consider multiple matrices you are multiplying, obviously, the dimensions of resultant matrix will be (length of first matrix X breadth of last matrix).

If it still is unclear, refer here.

#4

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