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Question

Read the information given below and answer following two questions.

A bag contains 4 red, 4 green and 4 blue balls.

Two balls are drawn at random without replacement.

Q50. What is the probability that one ball is blue and other green?

नीचे दी गई जानकारी को पढ़िये और इसके आगे आने वाले प्रश्नों के उत्तर दीजिए।

एक थैले में 4 लाल, 4 हरी और 4 नीली गेंदें हैं।

बिना बदले दो गेदों को यादृच्छिक रूप से निकाला जाता है।

Q50. एक गेंद नीली और दूसरी हरी होने की प्रायिकता क्या है?


A

1/9

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B

4/33

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C

14/33

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D

8/33

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Solution

The correct option is D

8/33


Blue balls = 4, green balls = 4

Probability = 2 × 4/12 × 4/11 = 8/33 (multiplied by 2 as there are two possibilities – green ball 1st and blue ball 1st)

नीली गेंदें = 4, हरी गेंदें = 4

प्रायिकता = 2 × 4/12 × 4/11 = 8/33 (2 से गुणा करने पर क्योंकि दो संभावनाएँ हैं – 1st हरे रंग की गेंद और 1st नीले रंग की गेंदें)


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