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Permutations and Combinations - Data Intensity 1 Multiple Questions and Answers.
| 6. | How many four digit even numbers can be formed using the digits {2, 3, 5, 1, 7, 9} | ||
| A. | 60 | ||
| B. | 360 | ||
| C. | 120 | ||
| D. | 240 | ||
| 7. | How many four digit numbers can be formed using the digits {1, 3, 4, 5, 7,9}(repetition of digits is not allowed)? | ||
| A. | 360 | ||
| B. | 60 | ||
| C. | 300 | ||
| D. | 180 | ||
| 8. | The number of ways in which six boys and six girls can be seated in a row for a photograph so that no two girls sit together is_________? | ||
| A. | (6!)2 | ||
| B. | 6! * ?P? | ||
| C. | 2(6!) | ||
| D. | 6! * 7 | ||
| 9. | A letter lock consists of three rings each marked with six different letters. The number of distinct unsuccessful attempts to open the lock is at the most__________? | ||
| A. | 216 | ||
| B. | 243 | ||
| C. | 215 | ||
| D. | 729 | ||
| 10. | A committee has 5 men and 6 women. What are the number of ways of selecting a group of eight persons? | ||
| A. | 165 | ||
| B. | 185 | ||
| C. | 205 | ||
| D. | 225 | ||
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