Mathematical induction divide exercise

Mathematical induction divide exercise
We solve 5 exercises:

4 divides 5^n-1
6 divides 7^n-1
5 divides 11^n-6
6 divides n(n^2+5)

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https://www.youtube.com/watch?v=qphhG_1rWf8&list=PLg9w7tItBlZtI1eM6znSYfyDEaqQtUx5b

Probability theory:

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Complex analysis:

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additive combinatorics:

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微積分 高等微積分 代數

Calculus and advanced mathematics (abstract algebra):

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Real analysis

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Reduction formula in Calculus:

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數論跟其他:

number theory and others:

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