Solution: The total ways to select 4 items: $\binom{25}{4} = 12650$. The unfavorable case (no turtles) is $\binom{15}{4} = 1365$. The probability of at least one turtle is $1 - \frac{1365}{12650} = 1 - \frac{273}{2530} = \frac{2257}{2530}$. The answer is $\boxed{\dfrac{2257}{2530}}$.

Sat, 02 May 2026 19:06:37 +0000

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