Elitmus Exam Numerical Ability Data Sufficiency

a bag contains white and black ball.2 ball is drawn from bag at random.what is the probablity of getting white ball.
1,black ball probablity is 1/3.
2.white ball is 24

Read Solution (Total 5)

1/18

White balls=24, which are 2/3 ,So black balls=12, Total balls=36
Selecting 2 white balls=(2/3)*(2/24)=1/18
9 years agoHelpfull: Yes(16) No(2)

both statrments are required to find the answer.
9 years agoHelpfull: Yes(6) No(0)
neither 1 or 2 is sufficient to answer the question
9 years agoHelpfull: Yes(0) No(0)
answer d check
9 years agoHelpfull: Yes(0) No(0)
either 1 and 2 is sufficient for ans
7 years agoHelpfull: Yes(0) No(0)

Elitmus Other Question

Three cards are drawn from pack of ordinary cards.what is the probability the card drawn is king,queen and jack. Four mirrors are erected perpendicular to the ground to from a rectangle ABCD (where A,B,C,D are four corners of the

Rectangle ) the longer mirror are of length 15cms and shorter mirrors are of length 4cms the reflective surface of all

Mirrors are facing inwards and there is negligible gap b/w two mirrors at the four corners through which nothing more than

a laser beam is shot at mirror BC(longer mirror)through the gap at point A. In a plane parallel to the ground.

Q1 How many times will the laser beam bounce off a mirror surface before exiting the rectangle from point C , if the beam

travels a total distance of 25cm inside the rectangle.
A) 5 B) 4 C)3 D)none

Q2) How many times will the laser beam bounce off a mirror surface before exiting the rectangle from point A, if the beam

Travels the shortest possible distance inside the rectanagle.
A)22 B)15 C)4 D)none