Maths-
General
Easy
Question
There are 12 balls numbered from 1 to 12. The number of ways in which they can be used to fill 8 places in a row so that the balls are with numbers in ascending or descending order is equal to-
- 12C8
- 12P8
- 2 × 12P8
- 2 × 12C8
The correct answer is: 2 × 12C8
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