Symbiosis National Aptitude Test SNAP 2015 Paper

Question : 29 of 150

Marks: +1, -0

In a class, 30% of the students offered English, 20% offered Hindi and 10% offered both. If a student is selected at random, what is the probability that he has offered English or Hindi?

2/5
3/4
3/5
3/10

Validate

Solution:

P (E) =

{30}/{100}

3/{10}

, P (H) =

{20}/{100}

1/5

and
P (E ∩ H) =

{10}/{100}

1/{10}

P (E or H) = P (E ∪ H)
= P (E) + P(H) – P (E ∩ H)
=

(3/{10}-1/5-1/{10})

4/{10}

2/5

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