Question Discussion & Solution

The pattern is as follows:

The first letter in each group is a series of vowels in reverse alphabetical order.

The second letter in each group is the opposite letter to the first one.

Hence, “AZ” is the correct answer.

The correct answer is Output.

Key Points

• Output devices allow us to receive information from the computer.
• An output device is any hardware device used to send data from a computer to another device or user.
• Examples of output devices are-
  • monitors and projectors (video), headphones and speakers (audio), or printers and plotters (physical reproduction in the form of text or graphics).

Here the pattern is,

• In SQL, the function - avg, min, max, sum, count is called as aggregate function.
• Aggregate functions return a single value after calculating from a group of values.
• avg() function returns the average values, max() returns the maximum value, count() finds the number of rows that matches the specified condition, min() returns the minimum value, Max() returns the maximum value. sum() returns the sum of values.

Example:

SELECT AVG(salary

FROM employees

GROUP BY department_id;

Hence, “21” will come next.