siriusmart OP Mod , (edited )
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Hint:

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It is often helpful to visualise the problem, build it in minecraft to see if u notice anything.

Note that the sum of first n natural numbers can be proven without induction, as shown below
https://lemmy.world/pictrs/image/854e5b2e-02ed-41a5-a93e-6c61355fbf30.png


Solutions:

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