NCHMCT JEE 2015 Question Paper with solutions for online practice

Question : 20 of 200

Marks: +1, -0

In a hall, there are 10 persons each of blood group A, B, AB and O. If one person is called, what is the probability of having them from blood group A or B?

1/10
1/4
1/6
None of these

Validate

Solution:

Probability of blood group A =

{\,↖{10}C_1}/{\,↖{40}C_1}

{10}/{40}

1/4

Probability of blood group B =

{\,↖{10}C_1}/{\,↖{40}C_1}

{10}/{40}

1/4

∴ Required probability blood group A or B
=

1/4+1/4

2/4

1/2

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