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The fifth term of a geometric sequence is 781.25. Each term of the sequence is 1/5 of the value of the following term. Which recursive formula represents the situation?

a) aₙ=5aₙ₋₁​; a₁​=488.28125
b) aₙ=5aₙ₋₁​; a₁​=1.25
c) aₙ=1/5​aₙ₋₁​; a₁​=1.25
d) aₙ​=1/5aₙ₋₁​; a₁​=488.28125