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P, Q, R, S are to give lecture to an audience. The organizer can arrange the order of their presentation in :

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P, Q, R, S are to give lecture to an audience. The organizer can arrange the order of their presentation in : 

(a) 256 ways 

(b) 24 ways 

(c) 4 ways 

(d) 12 ways

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1 Answer

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Best answer

Correct option (b) 24 ways

Explanation:

Since there are 4 people P, Q, R, S who are to give lecture to an audience. 

∴ The number of ways in which their presentation can be arranged 

= 4 ! = 4 × 3 × 2 × 1 = 24.

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