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In how many ways can we arrange ‘n’ things in a row?1. (n+1)!2. (n‐1)!3. 2n!4. n! |
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Answer» Correct Answer - Option 4 : n! Given In how many ways can we arrange 'n' things in a row Calculation : Number of ways of arrange n things(If n = 5!) ⇒ 5× 4 × 3 × 2× 1 = 120 ways to arrange fine objects . In general say that there are n! permutations of n objects . This quantity nCr is called the "combination" and represents the probability of picking r distinguishable outcomes out of n without regard to the order of picking each outcome. ∴ The required answer is n!. |
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