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Question : Directions: In a class, 80 students study both Computer Science and Electronics. While 100 students study Computer Science. 120 students study Electronics. How many of them study Computer Science only?

Option 1: 100

Option 2: 40

Option 3: 180

Option 4: 20


Team Careers360 17th Jan, 2024
Answer (1)
Team Careers360 19th Jan, 2024

Correct Answer: 20


Solution : As per the instructions, the Venn diagram will be –

In the above figure, there are 3 regions, namely, a, b, and c.
a represents the students who study only Electronics.
c represents the students who study only Computer Science.
b represents the students who study both Electronics and Computer Science.

As per the question –
b = 80; a + b = 120; b + c = 100
a = 120 – 80 = 40; c = 100 – 80 = 20

So, the number of students who study only Computer Science is 20. Hence, the fourth option is correct.

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