Comprehension

Answer these questions (Qs. 77 - 79) based on the following information.

There are 4 red balls, 4 green balls and 6 blue balls, in a box

If one ball is drawn randomly, what is the probability that it is either red or blue 

This question was previously asked in
CSIR-CLRI JSA 2024 Official Paper-I (Held On: 16 Feb, 2025)
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Answer (Detailed Solution Below)

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Detailed Solution

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Calculation:

Find the total number of balls:

Red balls: 4

Green balls: 4

Blue balls: 6

Total balls: 4 + 4 + 6 = 14

Find the number of red or blue balls:

Red balls: 4

Blue balls: 6

Red or blue balls: 4 + 6 = 10

Calculate the probability:

Probability = (Number of favorable outcomes) / (Total number of possible outcomes)

Probability (red or blue) = 10 / 14

Simplify the fraction:

10 / 14 = 5 / 7

Answer:

The probability of drawing a red or blue ball is 5/7.

Latest CSIR Junior Secretariat Assistant Updates

Last updated on Jun 24, 2025

-> The CSIR Junior Secretariat Assistant 2025 has been released for 9 vacancies.

-> Candidates can apply online from 17th June to 7th July 2025.  

-> The CSIR JSA salary ranges from INR 19,900 - INR 63,200 (Indian Institute of Petroleum, Dehradun & Institute of Microbial Technology) and INR 35,600 (Indian Institute of Toxicology Research).

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