roughworks

UCEED 2019

0/85
UCEED2019Q54·mcq·Hard

Four students P, Q, R and S are shown a box which contains a few white balls, and a few red balls. Their teacher asks each of them individually to make a statement. The teacher knows that exactly one of them is a liar and others are not. From the statements that they make, the teacher is able to find out who the liar is. P says: There are equal number of red balls and white balls. Q says: P is a liar and there are 3 red balls and 2 white balls. R says: Q is not a liar and there are some red balls and some white balls in the box. S says: R is not a liar. Who is the liar?