Question 28
Permutations and CombinationsGiven that nPr = 90 and nCr = 15, find the value of r.
- A.2
- B.3
- C.5
- D.6
Show the answer and explanation
Answer: B (3)
Explanation
nPr = r! × nCr, so r! = 90 ÷ 15 = 6 and r = 3.
Given that nPr = 90 and nCr = 15, find the value of r.
Answer: B (3)
nPr = r! × nCr, so r! = 90 ÷ 15 = 6 and r = 3.