Explanation

Step 1: Determine the pattern

Given 3 = 6, 6 = 30, and 5 = 20, let's find the pattern.

For 3 = 6, it could be 3 * 2 = 6.

For 6 = 30, it could be 6 * 5 = 30.

For 5 = 20, it could be 5 * 4 = 20.

Step 2: Identify the pattern

The pattern seems to be n * (n-1) or another pattern based on the given numbers.

Step 3: Test the pattern n * (n-1) or n * x

If we apply n * (n-1):

3 * (3-1) = 3 * 2 = 6

6 * (6-1) = 6 * 5 = 30

5 * (5-1) = 5 * 4 = 20

This pattern fits.

Step 4: Apply the pattern to 7

7 * (7-1) = 7 * 6 = 42