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1996 AMC 12 Question 8

AMC12 · 1996 AMC 12

Question 8

If $3=k\cdot2^r$ and $15=k\cdot4^r,$ then $r=$
  1. $-\log_2 5$
  2. $\log_5 2$
  3. $\log_{10}5$
  4. $\log_2 5$
  5. $\frac52$