Question:

In a collage of 300 students, every student reads 5 newspapers and every newspaper is read by 60 students. The number of newspapers is

Updated On: Dec 9, 2022
  • atleast 30
  • atmost 20
  • exactly 25
  • None of these
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The Correct Option is C

Solution and Explanation

Let n be the number of newspapers which are read by the students.
Then, $60n = (300) \times 5\Rightarrow n = 25$
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Questions Asked in JEE Advanced exam

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Concepts Used:

Permutations and Combinations

Permutation:

Permutation is the method or the act of arranging members of a set into an order or a sequence. 

  • In the process of rearranging the numbers, subsets of sets are created to determine all possible arrangement sequences of a single data point. 
  • A permutation is used in many events of daily life. It is used for a list of data where the data order matters.

Combination:

Combination is the method of forming subsets by selecting data from a larger set in a way that the selection order does not matter.

  • Combination refers to the combination of about n things taken k at a time without any repetition.
  • The combination is used for a group of data where the order of data does not matter.