Institution: Bangladesh Development Bank Exam: Bangladesh Development Bank Ltd - Senior Officer - 24.11.2017
Topic: Mathematics (সাধারণ গণিত), Subject: Mathematics (সাধারণ গণিত)

Best Answer Explained in Below-:

To determine the probability of randomly drawing a king or a queen from a standard deck of 52 cards, we first need to identify how many favorable outcomes there are for this event.

In a standard deck, there are 4 suits (hearts, diamonds, clubs, and spades), and each suit contains one king and one queen. Therefore, in total:

- There are 4 kings (one from each suit).
- There are 4 queens (one from each suit).

Adding these together gives us a total of 8 favorable outcomes (4 kings + 4 queens).

Next, we calculate the probability using the formula for probability:

\[
\text{Probability} = \frac{\text{Number of favorable outcomes}}{\text{Total number of outcomes}} = \frac{8}{52}
\]

Now simplifying the fraction:

\[
\frac{8}{52} = \frac{2}{13}
\]

Upon reviewing, the correct counting shows there are indeed 8 favorable outcomes, thus the output should reflect:

\[
\frac{8}{52} = \frac{2}{13}
\]

It seems there was an initial misunderstanding regarding the choices. The correct answer for the probability of drawing a king or queen is actually *B: 2/13*, not D: 4/13.