Try this problem from I.S.I. B.Stat Entrance Objective Problem based on Arrangement in a Ring.

Arrangement in a Ring ( B.Stat Objective Question )


The number of ways 5 persons PQRST seats in a ring so that P sits between Q and R is

  • 104
  • 4
  • 1154
  • none of these

Key Concepts


Integers

Number of ways

Arrangements

Check the Answer


But try the problem first…

Answer: 4.

Source
Suggested Reading

B.Stat Objective Problem 103

Challenges and Thrills of Pre-College Mathematics by University Press

Try with Hints


First hint

here SQPRT, TQPRS, SRPQT, TRPQS

Second Hint

are 4 arrangements in 1 way (orderwise)

Final Step

number of ways =\(4 \times 1\)=4 ways.

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