How can I count the repeating number of some certain expression in a list?

Question:How can I count the repeating number of some certain expression in a list?

Posted: rhenskyyy 0 Product: Maple

April 23 2012

For example, in the list [1,1,1,1,2,4,6,1,9], how many 1s are there?

Is there a procedure in Maple? Or how can I manage to do it?

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