Question
Five different pens out of which 2 are red and the rest
are blue are to be arranged in a line. Find the number of ways in which the two red pens are not placed together.Solution
Total number of ways to arrange 5 pens = 5! = 120 ways
If we consider 2 red pens as one item, number of arrangements = 2! = 2 ways
Number of arrangements of remaining 4 items = 4! = 24 ways
Therefore, required number of ways = 120 – (2 × 24) = 72 ways
Read the directions carefully and answer the following question.
Seven friends, D, E, F, G, H, I and J, are sitting in a straight line, all fac...
Five friends B, C, D, E and F are sitting in a straight line all facing in the north direction. B is sitting at one of the extreme ends. Three people ar...
Eight persons, R, S, T, U, V, W, X and Y, sit around a square table and faces towards the centre of the table. Four of them sit at the corner of the tab...
Which of the following person sits sixth to the left of the one who works in company B?
What is the sum of present age of C and the one who is third to the right of C?
Who sits third to the right of the person, who likes Coca cola in the row arrangement? Â
Seven persons S, T, U, V, W, X and Y sit in a straight row facing north direction. U sits third to the left of S. T sits adjacent to S. V sits second t...
--------------- and ---------sit adjacent to V.
How many unknown person sits in the table?
Who sits second to the right of Z?
