Two balls are drawn at random from a bag \( \mathrm{P} \) containin...

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Two balls are drawn at random from a bag
\( \mathrm{P} \) containing 4 red and 6 black balls. Find the

W probability that either both are red or both are black.
(1) \( \frac{7}{15} \)
(2) \( \frac{8}{15} \)
(3) \( \frac{9}{15} \)
(4) \( \frac{6}{15} \)
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