Aspire Faculty ID #17576 · Topic: UGC NET Computer Science August 2024 (Paper II) · Just now
UGC NET Computer Science August 2024 (Paper II)

40 software professionals were interviewed for a job.

25 knew PYTHON, 20 knew JAVA and 7 knew neither language.

How many knew both languages?

Solution

Total people = 40
People who know neither = 7

So people who know at least one language:

40 − 7 = 33

Use formula:

n(P ∪ J) = n(P) + n(J) − n(P ∩ J)

33 = 25 + 20 − x

33 = 45 − x

x = 12

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