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Four at a time (Posted on 2019-05-16) Difficulty: 3 of 5
a1a2a3a4 + a2a3a4a5 + ... + ana1a2a3 = 0 with ai = +1 or -1 for i = 1, 2, 3, ..., n. Show that n is divisible by 4.

No Solution Yet Submitted by Danish Ahmed Khan    
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