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There are 12 balls numbered from 1 to 12...

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

A

`""^(12)C_(8)`

B

`""^(12)P_(8)`

C

`2xx""^(12)P_(8)`

D

`2xx""^(12)C_(8)`

Text Solution

Verified by Experts

The correct Answer is:
D
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AAKASH SERIES-PERMUTATIONS & COMBINATIONS-EXERCISE-II
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