In how many ways can a delegation of 2 people be chosen from a group of 7 people?
Answer and explanation
Correct answer: D.
- Step 1: Order does not matter, so use . Step 2. . **Answer: . Why not the others:** counts ordered selections; multiplies instead of choosing; adds an extra term.
Practise more Applied arithmetic and geometry.
Free questions with an explanation for every one, and full timed SEE (Secondary Education Examination, Nepal) mock tests.
More Applied arithmetic and geometry questions
- The price of a camera is 400. It is first increased by 20% and then the new price is decreased by 30%. What is the final price?
- 35% of a number is 28. What is the number?
- The mean of 6 numbers is 60. Of them, 5 are 53, 52, 68, 69, 48. What is the remaining number?
- A train travels from A to B at 60 km/h and returns along the same road at 30 km/h. What is the average speed for the whole trip, in km/h?
- One pipe fills a pool in 3 hours and another pipe fills it in 6 hours. How many hours does it take to fill the pool when both pipes are open…
- What is the difference between the compound interest and the simple interest on 1000 for 3 years at 4% per year (compounded annually)?