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1977 AMC 12 Question 10

AMC12 · 1977 AMC 12

Question 10

If $(3x-1)^7=a_7x^7+a_6x^6+\cdots+a_0,$ then $a_7+a_6+\cdots+a_0$ equals
  1. $0$
  2. $1$
  3. $64$
  4. $-64$
  5. $128$