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**1. Homework Statement**

On average a certain jockey falls from her horse once in every 10 rides. What is the probability that she will fall from her horse

__at least__once in the next ten rides?

**2. Homework Equations**

Answer is 0.651.

**3. The Attempt at a Solution**

I've no idea .. I thought of adding up the probabilities of the jockey falling once, twice, thrice, etc. but that just gives me an answer greater than 1 which would not make sense.

P(Fall at least once) = (1/10) + (1/10 + 1/10) + (1/10 + 1/10 + 1/10) + ...

= 55/10