Prove the following by using the princip...

Prove the following by using the principle of mathematical induction for all `n in N`
`a+ar + ar^2 +…….+ ar^(n-1) = (a(r^n - 1))/(r - 1)`

PRINCIPLE OF MATHEMATICAL INDUCTION
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PRINCIPLE OF MATHEMATICAL INDUCTION
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PERMUTATIONS AND COMBINATIONS
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PROBABILITY
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