CA Foundation P3 · Chapter 5 · Question 6 of 9
If ⁿP₂ = 90, then n is:
Test yourself: pick an answer
Reveal answer & explanation
Correct answer: C) 10
Explanation
ⁿP₂ = n(n − 1) = 90. Since 10 x 9 = 90, n = 10 (the negative root −9 is rejected).
More Basic Concepts of Permutations and Combinations MCQs
- Q8In how many ways can the letters of the word ARTICLE be arranged so that the vowels occupy only the even positions?
- Q9If ⁿC₈ = ⁿC₁₂, then ⁿC₁₇ is equal to:
- Q1The number of different arrangements of the letters of the word LEDGER is:
- Q2In how many ways can a committee of 3 be chosen from 8 persons?
- Q3A committee of 5 is to be formed from 6 men and 4 women. In how many ways can this be done if the committee must contain exactly 2 women?