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A box contains 10 identical balls, labelled 1, 2, 3... 10. A robot is known to report the wrong answer 30% of the times. The

A box contains 10 identical balls, labelled 1, 2, 3... 10. A robot is known to report the wrong answer 30% of the times. The robot picks a ball at random from the box and reports that its number is Four. Find the probability that the ball picked up is truly number Four

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