# Sample 指令 ##### 指令分類 （所有指令）

Sample[ <List>, <Size> ]

Sample[ <List>, <Size>, <With Replacement> ]

## CAS 視窗

Sample[ <List>, <Size> ]

Sample[ <List>, <Size>, <With Replacement> ]

Sample[ <List L>, <Size n> ]
Returns list of n randomly chosen elements of L; elements can be chosen several times.

`Sample[{1, 2, 3, 4, 5}, 5]` yields for example {1, 2, 1, 5, 4}.
Sample[ <List L>, <Size n>, <Boolean for replacement> ]
Returns list of n randomly chosen elements of L. Elements can be chosen several times if and only if the last parameter is true.

`Sample[{1, 2, 3, 4, 5}, 5, true]` yields for example {2, 3, 3, 4, 5}.

## CAS Syntax

Sample[ <List L>, <Size n> ]
Returns list of n randomly chosen elements of L; elements can be chosen several times.

`Sample[{-5, 2, a, 7, c}, 3]` yields for example {a, 7, -5}.
Sample[ <List L>, <Size n>, <Boolean for replacement> ]
Returns list of n randomly chosen elements of L. Elements can be chosen several times if and only if the last parameter is true.

The list can include lists as well: Let List1 be {1, 2, 3}.
`Sample[{List1, 4, 5, 6, 7, 8}, 3, false]` yields for example {6, {1, 2, 3}, 4}.
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