Permutations And Combinations Question 262

Question: In how many ways can five examination papers be arranged so that physics and chemistry papers never come together

Options:

A) 31

B) 48

C) 60

D) 72

Show Answer

Answer:

Correct Answer: D

Solution:

  • Total arrangements of 5 papers are $ =5\ !=120 $ When physics and chemistry come together $ =4\ !\ \times 2\ !=48 $ Hence required number of ways are $ 120-48=72 $ .

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