In the name of God;

Testlib has nice random functions, here I want to suggest some other ones. The first and the second random functions are available in testlib, but the rest are not.

1,

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, $$$r$$$)}

Unable to parse markup [type=CF_MATHJAX]

to $$$r$$$ with equal probabilities :

2,

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, $$$r$$$, $$$w$$$)}

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to $$$r$$$ with monotonically increasing/decreasing probabilities :

3,

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, $$$r$$$, $$$c$$$)}

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to $$$r$$$ :

4, \text{