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For how many integers n where \(2 \le n \le 100\) is \(\binom{n}{2}\) odd?

 Jan 1, 2022
 #1
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$\binom{n}{2}$ is odd when $n \equiv 1 \pmod{4}$.  There are 25 numbers between 2 and 100 that work.

 Jan 1, 2022
 #2
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nvm I got the answer it is 50

 Jan 1, 2022

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