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
Which of the following is not correct about Sovereign Gold Bond (SGB)?
Which one of the following is the primary component of natural gas?
Terrestrial planets are composed of _________.Â
Which of the following dances is based on Rasleela themes of Radha and Krishna?
What is the minimum threshold for Public Sector Banks (PSBs) to report fraud cases to the CBI’s Banking Security and Fraud Cell (BSFC)?
In MCLR, what does M stand for?
Magnolia and Laurel trees are found in which type of forest in India?
Who won 2016 Chess Championship title?
Which state has the second highest number of seats in the Lok Sabha?
Who explained the structure of protein?
