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1958 AMC 12 Question 20

AMC12 · 1958 AMC 12

Question 20

If $4^x-4^{x-1}=24,$ then $(2x)^x$ equals:
  1. $5\sqrt5$
  2. $\sqrt5$
  3. $25\sqrt5$
  4. $125$
  5. $25$