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# HELP DUE VERY SOON!!!!

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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