What is Certain?

S0-SA3-0266

Grade Level:

Class 1

Logic, Probability, Computing, AI, Science

Definition

What is it?

Something is 'certain' if it will definitely happen, with no doubt at all. There is a 100% chance of it occurring, and nothing can change that outcome. It's an event that is guaranteed.

Simple Example

Quick Example

If you drop a cricket ball from your hand, it is certain to fall towards the ground. Gravity will always pull it down. It will never float up into the sky instead.

Worked Example

Step-by-Step

Let's think about a school week.
---Step 1: Consider the days of the week: Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday.
---Step 2: Today is Tuesday. What day will tomorrow be?
---Step 3: After Tuesday, the next day is always Wednesday.
---Step 4: Can tomorrow be Thursday? No, that's impossible.
---Step 5: Can tomorrow be Monday? No, that was yesterday.
---Step 6: So, it is certain that tomorrow will be Wednesday. There is no other possibility.
---Answer: Tomorrow will certainly be Wednesday.

Why It Matters

Understanding 'certainty' is fundamental in Science, where experiments aim for certain outcomes under specific conditions. In Computing and AI, programmers build systems that rely on certain rules to function correctly. It's crucial for engineers designing bridges or doctors prescribing medicines, ensuring predictable and safe results.

Common Mistakes

MISTAKE: Confusing 'certain' with 'very likely'. | CORRECTION: 'Certain' means 100% guaranteed, no chance of failure. 'Very likely' means a high chance, but not guaranteed.

MISTAKE: Thinking something is certain just because it happens most of the time. | CORRECTION: Even if an event usually happens, if there's any small chance it might not, it's not certain. For example, the sun rising is certain, but your bus arriving exactly on time is not, even if it usually does.

MISTAKE: Believing a future event is certain without enough information. | CORRECTION: For something to be certain, you need a clear rule, law, or condition that makes it impossible for any other outcome to occur. Don't guess; look for proof.

Practice Questions

Try It Yourself

QUESTION: Is it certain that if you put water in a freezer, it will turn into ice? | ANSWER: Yes, it is certain (assuming the freezer is working correctly and the temperature drops below 0 degrees Celsius).

QUESTION: Your favourite cricket team is playing. They have won 9 out of their last 10 matches. Is it certain they will win today's match? | ANSWER: No, it is not certain. While they are very likely to win, there's always a chance they might lose. Nothing guarantees a win before the match is over.

QUESTION: You have a bag with 5 red marbles and 0 blue marbles. If you pick one marble without looking, is it certain you will pick a red marble? Explain why. | ANSWER: Yes, it is certain. Since there are only red marbles in the bag, it is impossible to pick any other colour. You will 100% pick a red marble.

MCQ

Quick Quiz

Which of these events is certain?

It will rain tomorrow.

The sun will rise tomorrow morning.

You will win the lottery if you buy a ticket.

Your mobile phone battery will last all day.

The Correct Answer Is:

The sun rising tomorrow is a certain event based on the Earth's rotation. The other options are not certain; they depend on many unpredictable factors.

Real World Connection

In the Real World

When you use a navigation app like Google Maps or Ola, it calculates the certain path to your destination based on road networks. While traffic might make the time uncertain, the physical roads connecting two points are certain. Similarly, in banking, when you transfer money via UPI, it's certain that the money will be debited from your account and credited to the receiver's account if the transaction is successful.

Key Vocabulary

Key Terms

CERTAIN: Guaranteed to happen | IMPOSSIBLE: Cannot happen | PROBABILITY: The chance of something happening | GUARANTEED: Absolutely sure to happen

What's Next

What to Learn Next

Now that you understand what is certain, you can explore 'What is Impossible?'. This concept is the opposite of certain and will help you understand events that absolutely cannot happen, building your foundation in logical thinking.