From the question it is given that,
Mr. Mohan has a cumulative deposit account for 3 years.
Period = 
years
We know that, 
year = 
Months
So, 3 years 
Months
Rate = 
pa
Maturity amount = 
Then, Money deposited = Monthly value × Number of Month.
So, total principal for 1 month ![=\left[ p\times (36(36+1)) \right]/2](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-d268839b2fbacdcda3f54ab31e48f200_l3.png "Rendered by QuickLaTeX.com")
Now, interest = 
years
We know that, year = Months
So, 3 years Months
Rate = pa
Maturity amount =
Then, Money deposited = Monthly value × Number of Month.
So, total principal for 1 month
Now, interest =
![\[\begin{array}{l} \square \vec{r}=(\hat{i}+\hat{j})+\lambda(2 \hat{i}-\hat{j}+\hat{k}) \\ \vec{r}=(2 \hat{i}+\hat{j}-\hat{k})+\mu(3 \hat{i}-5 \hat{j}+2 \hat{k}) \end{array}\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-2f8ab5b81e582387cb9ae472791476e4_l3.png "Rendered by QuickLaTeX.com")
![\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{-2}](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-c5a91864ba7e1e0ed1b5d273d822f5e5_l3.png "Rendered by QuickLaTeX.com")
(b) ![\left[\mathrm{Pd}(\mathrm{CN})_{4}\right]^{2-}](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-ffda616d3dbe7dc8925722e87005924e_l3.png "Rendered by QuickLaTeX.com")
(c) ![\left[\mathrm{PdCl}_{4}\right]^{2-}](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-90cc6a4f4d42dee46e06d6f8ed516b7a_l3.png "Rendered by QuickLaTeX.com")
(d) ![\left[\mathrm{NiCl}_{4}\right]^{2}](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-149ee5c95bd9cfcc4405704fba2e1bab_l3.png "Rendered by QuickLaTeX.com")
(d) all of these