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1971 AMC 12 Question 7

AMC12 · 1971 AMC 12

Question 7

$2^{-(2k+1)}-2^{-(2k-1)}+2^{-2k}$ is equal to:
  1. $2^{-2k}$
  2. $2^{-(2k-1)}$
  3. $-2^{-(2k+1)}$
  4. $0$
  5. $2$