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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 is:

${}^{12}C_{8}$
${}^{12}P_{8}$
$2 \times^{12} P_{8}$
$2 \times^{12} C_{8}$

hint Hint:

In the question we not only have to choose 8 balls from the 12 balls which are numbered but also we have to fill them in 8 places, So, we have to use the formula $P presuperscript n subscript r$ .

The correct answer is: $P presuperscript 12 subscript 8$

As we have to fill 8 places from 12 balls numbered 1 to 12.
So, the number of ways = $P presuperscript 12 subscript 8$

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