Probability
Aptitude

 Back to Questions
Q.

A special lottery is to be held to select a student who will live in the only deluxe room in a hostel. There are 100 Year-III, 150 Year-II and 200 Year-I students who applied.

Each Year-III's name is placed in the lottery 3 times; each Year-II's name, 2 times and Year-I's name, 1 time. What is the probability that a Year-III's name will be chosen?

 A.

1/8

 B.

2/9

 C.

2/7

 D.

3/8

 Hide Ans

Solution:
Option(D) is correct

Total names in the lottery,

$= 3×100 + 2×150 + 200$

$= 800$

Number of Year-III's names,

$= 3×100$

$= 300$

Required probability,

$= \dfrac{300}{800}$

$= \textbf{3/8}$


(1) Comment(s)


???? ???
 ()

we have to calculate number of year-III RATHER YEAR-II