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Given an example of a statement P(n) suc...

Given an example of a statement `P(n)` such that it is true of all `n inNdot`

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`P(n) = 1 + 2 + 3 + - - - - - + n = (n(n+1))/2`
` P(n)` is true for all natural numbers
. Hence, `P(n)` is true for all `n∈N`
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