If $P (n)$ is the statement $n^{2} + n$ is even, and if $P (r)$ is true then $P (r + 1)$ is true.

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P (n)

is the statement

n^{2} + n

is even, and if

P (r)

is true then

P (r + 1)

is true.

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Question Text

P (n)

is the statement

n^{2} + n

is even, and if

P (r)

is true then

P (r + 1)

is true.

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