# A lottery claims that 10% of tickets win a prize. How many tickets should you purchase to be more than 50% sure of winning a prize?

You have to buy at least

[What is the point?] The concept I applied to this question is called complementary event. https://tutor.hix.ai

This idea is useful to evaluate the probability for having at least one event. Consider a simpler case and you will notice the convenience.

It will be complicated. Insted, you can solve it from the back door.

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

- On a spinner, #P(3) = 2/5# and the #P(4) = 3/8#, what is the probability of getting 3 or 4?
- Can someone help me answer this question?
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- Kevin is rolling two dice together and adding them up. Which sums should come up the most frequently?

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