Question

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

Answer 1

Answer:

The number of arrangement when Physics and Chemistry papers do not come together =  72 ways

Step-by-step explanation:

The number of ways in which 5 papers can be arranged = 5! ways = 120 ways

When two papers Physics and Chemistry are arranged together, consider this as only one paper, Therefore we have 4 papers.

Number of ways in which Physics and Chemistry are arranged together = 4! ways,

Also these two papers can be arranged themselves in 2! ways.

Number of arrangement when Physics and Chemistry papers are come together = 4!2! =48

Therefore number of arrangement when Physics and Chemistry papers do not come together = 5! - 4!2! =  120 - 48 = 72 ways

Answer 2

Step-by-step explanation:

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