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1974 AMC 12 Question 17

AMC12 · 1974 AMC 12

Question 17

If $i^2=-1,$ then $(1+i)^{20}-(1-i)^{20}$ equals
  1. $-1024$
  2. $-1024i$
  3. $0$
  4. $1024$
  5. $1024i$