What are the chances of getting a Kelpsy Berry from the Berry Master in ORAS?

Question

I'm asking because I accidentally used my last Kelpsy Berry that I was going to use for planting.

Answer 1

There are 10 possible berries you can receive. You get 2 from the berry master. I don't know if they can be the same or not so I'll do 2 calculations.

Can be same berry: This easy. You have a 2/10 chance here so your chances are 1/5 or 20%

Can not be same berry: The fraction is a bit different. The first berry is 1/10 and the second is 1/9. So 9/90 + 10/90 = 19/90. That's approximately 21%.

Comments

I'm not sure, but I think that the asker doesn't care if both of the berries he gets are Kelpsy Berries. He only wants one to plant

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That's not why Woonder but both calculations.  It affects the answer for what the chance is to get a Kelpsy.

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Oh! So if I go to the Berry Master 5 days in a row, then I will have a really good chance of getting a Kelpsy Berry? Correct me if I'm wrong. I was never good at this probability stuff.

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Not necessarily, as probability is worked independently. It means every day you have a 1/5 chance, so you may get one every day or never get one until the end of time. Probability is wierd, :p

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But if the berries cannot be the same, the second roll is 1/9 instead of 1/10, instead of rolling 1/10 twice if they could be the same.  It is mathematically different.

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That's what I have it as lol