Question: Create matrices ` A ` , ` B ` and vector ` d ` with the following code. Write codes to answer questions 3 a

Create matrices `A`,`B` and vector `d` with the following code. Write codes to answer questions 3a-3e.
```{r}
A <- matrix(3,4,5)
B <- matrix(rnorm(15),3,5)
d <-1:3
```
-**3a.** Compute the matrix multiplication $AB^T$ or give an explanation if there is an error, where $B^T$ means the transpose of matrix $B$.

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