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Question

A box contains 150 oranges. If one orange is taken out from the box at random and the probability of its being rotten is 0.06, then find the number of good oranges in the box.

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Solution

Total number of oranges = 150
Probability of it being good =1 - 0.06 = 0.94
Let the number of good oranges be x.
P(getting good oranges) = Number of good orangesTotal number of oranges
0.94=x150
x=0.94×150 =141
Hence, the required number of good oranges in the box is 141.

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