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What is an Assumption (Logic)?
Grade Level:
Pre-School – Class 2
All domains without exception
Definition
What is it?
An assumption is something we believe to be true without any proof or direct evidence. It's a 'silent' idea or fact that we take for granted when making a statement or a plan. We assume things so that our statements or actions make sense.
Simple Example
Quick Example
Imagine your mother tells you, 'Go buy 2 kg of potatoes from the market.' Her statement has an assumption. She is assuming that the market has potatoes today and that you have money to buy them. If either of these is not true, her instruction might not work.
Worked Example
Step-by-Step
Let's say your friend Rohan says, 'I will score 90% in my Maths exam next week.'
1. Rohan's statement: 'I will score 90% in my Maths exam next week.'
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2. What must be true for this statement to be possible, even if not guaranteed?
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3. He must be studying for the exam. (If he doesn't study, 90% is unlikely).
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4. He must attend the exam. (If he misses it, he can't score).
-----5. The exam must actually happen next week. (If it gets postponed, his timing is off).
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6. These unstated beliefs (studying, attending, exam happening) are the assumptions Rohan is making when he says he will score 90%.
Why It Matters
Understanding assumptions is super important in problem-solving and critical thinking. It helps you find hidden flaws in arguments, make better decisions, and even build smarter computer programs. Many engineers, scientists, and even detectives use this skill daily.
Common Mistakes
MISTAKE: Confusing an assumption with a fact | CORRECTION: A fact is proven true, an assumption is believed true without proof. Always question if an assumption is actually true.
MISTAKE: Thinking assumptions are always wrong | CORRECTION: Assumptions aren't necessarily wrong, they are just unproven. Sometimes they are true, sometimes they are not. The key is to identify them.
MISTAKE: Ignoring assumptions completely when evaluating an argument | CORRECTION: Always look for unstated beliefs. If a statement's main assumption is false, then the statement itself might be weak or incorrect.
Practice Questions
Try It Yourself
QUESTION: Your father says, 'Let's go to the beach this Sunday.' What is one assumption he is making? | ANSWER: He assumes the weather will be good on Sunday.
QUESTION: A TV advertisement says, 'Buy our new smartphone, and you'll be the coolest kid in school!' What is a key assumption this ad is making about you? | ANSWER: It assumes you care about being 'cool' and that a phone can make you cool.
QUESTION: Your coach tells the team, 'We will definitely win the inter-school cricket trophy this year if we practice hard.' What are two assumptions in his statement? | ANSWER: 1. He assumes that practicing hard is enough to guarantee a win (and not other factors like opponent's skill or luck). 2. He assumes the team will actually practice hard.
MCQ
Quick Quiz
Which of the following is an assumption in the statement: 'If I save ₹50 every day, I can buy a new bicycle in two months.'
The bicycle costs exactly ₹3000.
The person will not spend the saved money on anything else.
The person already has some money saved.
Bicycles are available in the market.
The Correct Answer Is:
B
The statement relies on the person actually saving the money and not using it. While other options might be true, the core unstated belief for the plan to work is that the saved money remains for the bicycle.
Real World Connection
In the Real World
When you use a navigation app like Google Maps or Ola, it makes many assumptions. For example, it assumes roads are open, traffic data is accurate, and your vehicle can travel at certain speeds. If these assumptions are wrong (e.g., a road is closed for construction), your estimated arrival time will be incorrect.
Key Vocabulary
Key Terms
BELIEF: Something accepted as true | EVIDENCE: Facts or information indicating whether a belief is true or valid | UNSTATED: Not expressed or said aloud | IMPLICIT: Suggested without being directly expressed | PROOF: Evidence or argument establishing a fact or truth
What's Next
What to Learn Next
Now that you understand assumptions, you can move on to learning about 'Inference' and 'Conclusion'. These concepts build on identifying assumptions to help you draw correct logical results from given information. Keep thinking critically!
