Rajesh went to a shop to purchase erasers. He bought 8 triangular shape erasers of which 3 are g...

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Rajesh went to a shop to purchase erasers.
He bought 8 triangular shape erasers of which 3 are grey and rest are black, and 10 square shape erasers of which 6 are grey and rest are black. One of his eraser lost at random.
Find the probability that lost eraser is of triangular shape.
a. \( \frac{4}{9} \)
b. \( \frac{5}{9} \)
c. \( \frac{1}{3} \)
d. \( \frac{5}{18} \)
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