JEE MATHEMATICS MCQ: PROBABILITY

1 Easy

1 of 1

Application +4 | -1

A bag contains

\left( {2\;n + 1} \right)

coins. It is known that

n

of these coins have a head on both sides, whereas the remaining

n + 1

coins are fair. A coin is picked up at random from the bag and tossed. If the probability that the toss results in a head is 31/42, then

n

is equal to

View answer and explanation

Correct option: A

Option A (10) is correct because solving the probability equation derived from the given conditions yields n = 10.

More Questions from PROBABILITY

Practice All Chapter MCQs →

\begin{array}{cccccc}X: & 1 & 2 & 3 & 4 & 5 \\ P(X): & k^2 & 2 k & k & 2 k & 5 k^2\end{array}

P(X>2)

A

B

P\left( {A \cap B'} \right) = \frac{3}{{25}}

P\left( {A' \cap B} \right) = \frac{8}{{25}}

P\left( A \right)

A

B

A

B

B

A

X

P\left( {X = 0} \right) = \frac{{144}}{{169}},\;P\left( {X = 1} \right) = \frac{1}{{169}},

P\left( {X = 2} \right)