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

 Jun 29, 2020
 #1
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PLz answer asap.

 Jun 29, 2020
 #2
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n = (1, 3, 15, 21, 45, 55, 91, 105, 153, 171, 231, 253, 325, 351, 435, 465, 561, 595, 703, 741, 861, 903, 1035, 1081, 1225, 1275, 1431, 1485, 1653, 1711, 1891, 1953, 2145, 2211, 2415, 2485, 2701, 2775, 3003, 3081, 3321, 3403, 3655, 3741, 4005, 4095, 4371, 4465, 4753, 4851) = 50 odd integers

 Jun 29, 2020

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