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Java Recursion Practice Worksheet | 8 Problems + Answer Key PDF

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8 Java recursion problems from factorial and digit sums up to recursive binary search. Each one has starter code, an expected output to check against, and a full worked answer.

What's included:
- factorial(), sumDigits(), and gcd() using the Euclidean algorithm
- reverseString() and isPalindrome() without built-in reverse methods
- fibonacci() with two base cases
- countOccurrences() over an array using an index parameter
- binarySearch() traced recursively with the search space halving each call

Ontario K/A/T/C rubric included for each problem.

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Listed on Aug 21, 2026
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