Chintu put some Black marbles and some White marbles into a jar. He then asked h

Question

Chintu put some Black marbles and some White marbles into a jar. He then asked his brother Pintu to take out a marble. Pintu drew out a Black marble. Chintu asked Pintu to draw out another marble, and again he drew out a Black marble. Pintu thought there must be more Black marbles than White marbles in the jar and asked Chintu, "I wonder what is the probability of me drawing a Black marble on a third try?" Chintu replied, "Exactly 9/10 of what it was of drawing a Black marble on your first draw." Can you help Pintu to determine how many marbles of each colour had been in the jar in the beginning? Give the minimal possible answer. Also, Pintu knew that there were at least seven marbles in the jar in the beginning.

Explanation / Answer

Black marbles - 8.....White Marbles - 4

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