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mod-introduction > less20
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Return true if the given non-negative number is 1 or 2 less than a multiple of 20. So for example 38 and 39 return true, but 40 returns false. See also: Introduction to Mod

less20(18) → true
less20(19) → true
less20(20) → false

...Save, Compile, Run (ctrl-enter)

public boolean less20(int n) { }

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