Two balls are drawn in succession, = without replacement,

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**Answer is C**

- Probability of first ball white and second one black $=\left(\dfrac{10}{25}\right)\times \left(\dfrac{15}{24}\right)$
- Probability of first ball black and second one white$=\left(\dfrac{15}{25}\right)\times \left(\dfrac{10}{24}\right)$
- Probability $=$ sum of above two probabilities $=\dfrac{1}{2}.$

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