Please change the example [188 289] in your problem description to [188 189], as I believe [188 289] should return [9 1], rather than [9 9]. (By the way, great job picking 189 to use for a check. Right at the end of the two-digit numbers.)
Given a 4x4 matrix, swap the two middle columns
Find the nearest prime number
Index of a Rational number
Method of Common Differences part-2
Method of Common Differences part-1
nth Rational Number
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