How to solve XAT 2021 - Gk Question 4?

This question can be solved by applying the core concept explained in the solution above, followed by step-by-step calculation and elimination of options.

Which concept is tested in this question?

This question tests fundamental concepts commonly asked in XAT exams.

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XAT 2021 - Gk Question 4

This is a detailed step-by-step solution for XAT 2021 - Gk Question 4. Understand the concept, common mistakes, and expert tips to solve similar questions in XAT exam.

QADI

Number of white phones = 2
Number of black phones = 2
Number of red phones = 1
customer 1 will have 3 choices
customer 2 will have 3 choices
customer 3 will have 3 choices
Hence total choices = 3 x 3 x 3 = 27
The cases not possible = BBB, RRR,WWW, RRB,RBR,BRR, RRW,RWR, WRR
Possible cases = 18
Probability = 18/27 = 2/3

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