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The decay law states that N(t) =

  1. (a) N₀ e^(λ t)
  2. (b) N₀ e^(-λ t)
  3. (c) N₀ (1 - λ t)
  4. (d) N₀ λ t
Answer and solution

Answer (b) N₀ e^(-λ t)

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