COMSATS Mathematics — Permutations, Combinations and Probability
Permutations, Combinations and Probability is part of the Mathematics section of the NTS NAT-IE test COMSATS admits on (10 of the 90 MCQs). It breaks into 2 subtopics, and we hold 34 NAT-pattern practice MCQs on it, each with a written explanation. Tap a subtopic below to practise just that.
Subtopics (2)
How Permutations, Combinations and Probability is tested
Across the 7 NAT-pattern papers on ParhaiKrlo, Permutations, Combinations and Probability accounts for 10 questions. It appears in all 7, about 1.4 questions a paper. The heaviest was COMSATS Past Paper 07, with 2 questions.
| Paper | Questions |
|---|---|
| COMSATS Past Paper 07 | 2 |
| COMSATS Past Paper 06 | 1 |
| COMSATS Past Paper 05 | 2 |
| COMSATS Past Paper 04 | 1 |
| COMSATS Past Paper 03 | 2 |
| COMSATS Past Paper 02 | 1 |
| COMSATS Past Paper 01 | 1 |
Permutations, Combinations and Probability MCQs from the NAT-pattern papers
Try each one before opening the answer. Each comes with a short explanation.
- Q1 · COMSATS Past Paper 07 · Permutations, Combinations and Probability
How many different three-digit numbers can be formed from the digits 1, 2, 3 and 4 if no digit is repeated?
- A.64
- B.24
- C.12
- D.4
Show answer
Answer: B. 24 — 4 × 3 × 2 = 24.
- Q2 · COMSATS Past Paper 06 · Permutations, Combinations and Probability
If an event cannot happen under any circumstances, its probability is:
- A.0
- B.1/2
- C.1
- D.−1
Show answer
Answer: A. 0 — An impossible event never happens, so its probability is 0.
- Q3 · COMSATS Past Paper 05 · Permutations, Combinations and Probability
Two fair coins are tossed together. What is the probability of getting two heads?
- A.1/4
- B.1/3
- C.1/2
- D.3/4
Show answer
Answer: A. 1/4 — Outcomes HH, HT, TH, TT; only HH works: 1/4.