Video help added for Ex 1.1, 6 - In set {1, 2, 3}, R = {(1, 2), (2, 1)} is symmetric

We added video help to Ex 1.1, 6 - In set {1, 2, 3}, R = {(1, 2), (2, 1)} is symmetric for students who need to see the step move, not just read it.

Why this matters

Some doubts are not about the final answer. They are about the transition: why this line became the next line, why a formula was chosen, or why a shortcut is allowed.

What to do now

• Read the written solution first.
• Watch the video only where the step feels unclear.
• Try the same question again without pausing.

Use the video as a repair tool: watch the confusing part, then come back to solving.